91690568915 has 32 divisors (see below), whose sum is σ = 121741693632. Its totient is φ = 65739520000.

The previous prime is 91690568911. The next prime is 91690568951. The reversal of 91690568915 is 51986509619.

It is not a de Polignac number, because 91690568915 - 2² = 91690568911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91690568911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1258895 + ... + 1329735.

It is an arithmetic number, because the mean of its divisors is an integer number (3804427926).

Almost surely, 2^91690568915 is an apocalyptic number.

91690568915 is a deficient number, since it is larger than the sum of its proper divisors (30051124717).

91690568915 is a wasteful number, since it uses less digits than its factorization.

91690568915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71191.

The product of its (nonzero) digits is 5248800, while the sum is 59.

The spelling of 91690568915 in words is "ninety-one billion, six hundred ninety million, five hundred sixty-eight thousand, nine hundred fifteen".