91636446172 has 12 divisors (see below), whose sum is σ = 160369286616. Its totient is φ = 45816650000.

The previous prime is 91636446157. The next prime is 91636446197. The reversal of 91636446172 is 27164463619.

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, 256954 + ... + 499297.

It is an arithmetic number, because the mean of its divisors is an integer number (13364107218).

Almost surely, 2^91636446172 is an apocalyptic number.

It is an amenable number.

91636446172 is a deficient number, since it is larger than the sum of its proper divisors (68732840444).

91636446172 is a wasteful number, since it uses less digits than its factorization.

91636446172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786548 (or 786546 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The spelling of 91636446172 in words is "ninety-one billion, six hundred thirty-six million, four hundred forty-six thousand, one hundred seventy-two".