91639577564 has 12 divisors (see below), whose sum is σ = 161057542464. Its totient is φ = 45623136864.

The previous prime is 91639577551. The next prime is 91639577573. The reversal of 91639577564 is 46577593619.

It is a super-2 number, since 2×91639577564² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91639577497 and 91639577506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49161932 + ... + 49163795.

It is an arithmetic number, because the mean of its divisors is an integer number (13421461872).

Almost surely, 2^91639577564 is an apocalyptic number.

It is an amenable number.

91639577564 is a deficient number, since it is larger than the sum of its proper divisors (69417964900).

91639577564 is a wasteful number, since it uses less digits than its factorization.

91639577564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98325964 (or 98325962 counting only the distinct ones).

The product of its digits is 42865200, while the sum is 62.

The spelling of 91639577564 in words is "ninety-one billion, six hundred thirty-nine million, five hundred seventy-seven thousand, five hundred sixty-four".