91477173496920 has 64 divisors (see below), whose sum is σ = 280270489029120. Its totient is φ = 23874893506944.

The previous prime is 91477173496879. The next prime is 91477173496921. The reversal of 91477173496920 is 2969437177419.

It is a super-2 number, since 2×91477173496920² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91477173496921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8109672862 + ... + 8109684141.

It is an arithmetic number, because the mean of its divisors is an integer number (4379226391080).

Almost surely, 2^{91477173496920} is an apocalyptic number.

It is an amenable number.

91477173496920 is an abundant number, since it is smaller than the sum of its proper divisors (188793315532200).

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

91477173496920 is a wasteful number, since it uses less digits than its factorization.

91477173496920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16219357064 (or 16219357060 counting only the distinct ones).

The product of its (nonzero) digits is 144027072, while the sum is 69.

The spelling of 91477173496920 in words is "ninety-one trillion, four hundred seventy-seven billion, one hundred seventy-three million, four hundred ninety-six thousand, nine hundred twenty".