115320215511 has 32 divisors (see below), whose sum is σ = 176194641920. Its totient is φ = 74500860672.

The previous prime is 115320215509. The next prime is 115320215567. The reversal of 115320215511 is 115512023511.

It is a happy number.

115320215511 is a `hidden beast` number, since 115 + 3 + 20 + 2 + 15 + 511 = 666.

It is not a de Polignac number, because 115320215511 - 2¹ = 115320215509 is a prime.

It is a super-2 number, since 2×115320215511² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115320215111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243610 + ... + 538503.

It is an arithmetic number, because the mean of its divisors is an integer number (5506082560).

Almost surely, 2^115320215511 is an apocalyptic number.

115320215511 is a deficient number, since it is larger than the sum of its proper divisors (60874426409).

115320215511 is a wasteful number, since it uses less digits than its factorization.

115320215511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782292 (or 782286 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 115320215511 in words is "one hundred fifteen billion, three hundred twenty million, two hundred fifteen thousand, five hundred eleven".