215992639801 has 4 divisors (see below), whose sum is σ = 215993625232. Its totient is φ = 215991654372.

The previous prime is 215992639799. The next prime is 215992639861. The reversal of 215992639801 is 108936299512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 215992639801 - 2¹ = 215992639799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215992639861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910 + ... + 657256.

It is an arithmetic number, because the mean of its divisors is an integer number (53998406308).

Almost surely, 2^215992639801 is an apocalyptic number.

It is an amenable number.

215992639801 is a deficient number, since it is larger than the sum of its proper divisors (985431).

215992639801 is an equidigital number, since it uses as much as digits as its factorization.

215992639801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985430.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 215992639801 in words is "two hundred fifteen billion, nine hundred ninety-two million, six hundred thirty-nine thousand, eight hundred one".