915855552491 has 16 divisors (see below), whose sum is σ = 1022584590720. Its totient is φ = 813046960320.

The previous prime is 915855552487. The next prime is 915855552533. The reversal of 915855552491 is 194255558519.

It is a cyclic number.

It is not a de Polignac number, because 915855552491 - 2² = 915855552487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 915855552491.

It is not an unprimeable number, because it can be changed into a prime (915855552431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1865876 + ... + 2305038.

It is an arithmetic number, because the mean of its divisors is an integer number (63911536920).

Almost surely, 2^915855552491 is an apocalyptic number.

915855552491 is a deficient number, since it is larger than the sum of its proper divisors (106729038229).

915855552491 is a wasteful number, since it uses less digits than its factorization.

915855552491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443626.

The product of its digits is 16200000, while the sum is 59.

The spelling of 915855552491 in words is "nine hundred fifteen billion, eight hundred fifty-five million, five hundred fifty-two thousand, four hundred ninety-one".