991115362755 has 48 divisors (see below), whose sum is σ = 1964217528000. Its totient is φ = 452881649664.

The previous prime is 991115362729. The next prime is 991115362819. The reversal of 991115362755 is 557263511199.

It is a happy number.

991115362755 is a `hidden beast` number, since 9 + 9 + 1 + 1 + 1 + 5 + 3 + 627 + 5 + 5 = 666.

It is not a de Polignac number, because 991115362755 - 2⁸ = 991115362499 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23871 + ... + 1408119.

It is an arithmetic number, because the mean of its divisors is an integer number (40921198500).

Almost surely, 2^991115362755 is an apocalyptic number.

991115362755 is a deficient number, since it is larger than the sum of its proper divisors (973102165245).

991115362755 is a wasteful number, since it uses less digits than its factorization.

991115362755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386540 (or 1386537 counting only the distinct ones).

The product of its digits is 2551500, while the sum is 54.

The spelling of 991115362755 in words is "nine hundred ninety-one billion, one hundred fifteen million, three hundred sixty-two thousand, seven hundred fifty-five".