215484444261 has 20 divisors (see below), whose sum is σ = 321927864544. Its totient is φ = 143642305800.

The previous prime is 215484444251. The next prime is 215484444289. The reversal of 215484444261 is 162444484512.

215484444261 is a `hidden beast` number, since 2 + 1 + 548 + 4 + 4 + 4 + 42 + 61 = 666.

It is not a de Polignac number, because 215484444261 - 2⁵ = 215484444229 is a prime.

It is a super-2 number, since 2×215484444261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215484444251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 743406 + ... + 991776.

Almost surely, 2^215484444261 is an apocalyptic number.

It is an amenable number.

215484444261 is a deficient number, since it is larger than the sum of its proper divisors (106443420283).

215484444261 is a wasteful number, since it uses less digits than its factorization.

215484444261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259094 (or 259085 counting only the distinct ones).

The product of its digits is 983040, while the sum is 45.

The spelling of 215484444261 in words is "two hundred fifteen billion, four hundred eighty-four million, four hundred forty-four thousand, two hundred sixty-one".