215299834263801 has 45 divisors (see below), whose sum is σ = 362802138307791. Its totient is φ = 123027244181856.

The previous prime is 215299834263743. The next prime is 215299834263803. The reversal of 215299834263801 is 108362438992512.

The square root of 215299834263801 is 14673099.

It is a perfect power (a square), and thus also a powerful number.

215299834263801 is a `hidden beast` number, since 2 + 1 + 5 + 299 + 8 + 3 + 4 + 263 + 80 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 143127605324025 + 72172228939776 = 11963595^2 + 8495424^2 .

It is not a de Polignac number, because 215299834263801 - 2⁷ = 215299834263673 is a prime.

It is a super-3 number, since 3×215299834263801³ (a number of 44 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (215299834263803) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2156895645 + ... + 2156995461.

Almost surely, 2^{215299834263801} is an apocalyptic number.

215299834263801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

215299834263801 is the 14673099-th square number.

215299834263801 is the 7336550-th centered octagonal number.

It is an amenable number.

215299834263801 is a deficient number, since it is larger than the sum of its proper divisors (147502304043990).

215299834263801 is an frugal number, since it uses more digits than its factorization.

215299834263801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199668 (or 99827 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 215299834263801 in words is "two hundred fifteen trillion, two hundred ninety-nine billion, eight hundred thirty-four million, two hundred sixty-three thousand, eight hundred one".