91639653599 has 10 divisors (see below), whose sum is σ = 99276054960. Its totient is φ = 84590423112.

The previous prime is 91639653557. The next prime is 91639653613. The reversal of 91639653599 is 99535693619.

It is not a de Polignac number, because 91639653599 - 2¹² = 91639649503 is a prime.

It is a super-2 number, since 2×91639653599² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91639653529) 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 9 ways as a sum of consecutive naturals, for example, 1575719 + ... + 1632840.

It is an arithmetic number, because the mean of its divisors is an integer number (9927605496).

Almost surely, 2^91639653599 is an apocalyptic number.

91639653599 is a deficient number, since it is larger than the sum of its proper divisors (7636401361).

91639653599 is an frugal number, since it uses more digits than its factorization.

91639653599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208611 (or 3208572 counting only the distinct ones).

The product of its digits is 53144100, while the sum is 65.

The spelling of 91639653599 in words is "ninety-one billion, six hundred thirty-nine million, six hundred fifty-three thousand, five hundred ninety-nine".