991607151875 has 10 divisors (see below), whose sum is σ = 1239112297764. Its totient is φ = 793285721000.

The previous prime is 991607151809. The next prime is 991607151901. The reversal of 991607151875 is 578151706199.

It is a de Polignac number, because none of the positive numbers 2^k-991607151875 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 793285097 + ... + 793286346.

Almost surely, 2^991607151875 is an apocalyptic number.

991607151875 is a deficient number, since it is larger than the sum of its proper divisors (247505145889).

991607151875 is an equidigital number, since it uses as much as digits as its factorization.

991607151875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586571463 (or 1586571448 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 59.

The spelling of 991607151875 in words is "nine hundred ninety-one billion, six hundred seven million, one hundred fifty-one thousand, eight hundred seventy-five".