91665417636 has 96 divisors (see below), whose sum is σ = 264187929600. Its totient is φ = 27294900480.

The previous prime is 91665417631. The next prime is 91665417637. The reversal of 91665417636 is 63671456619.

It is a happy number.

91665417636 is a `hidden beast` number, since 9 + 1 + 66 + 541 + 7 + 6 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (91665417631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1009521 + ... + 1096568.

It is an arithmetic number, because the mean of its divisors is an integer number (2751957600).

Almost surely, 2^91665417636 is an apocalyptic number.

It is an amenable number.

91665417636 is an abundant number, since it is smaller than the sum of its proper divisors (172522511964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91665417636 is a wasteful number, since it uses less digits than its factorization.

91665417636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106146 (or 2106138 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The spelling of 91665417636 in words is "ninety-one billion, six hundred sixty-five million, four hundred seventeen thousand, six hundred thirty-six".