91909550455440 has 320 divisors, whose sum is σ = 298337014923264. Its totient is φ = 23377939200000.

The previous prime is 91909550455417. The next prime is 91909550455477. The reversal of 91909550455440 is 4455405590919.

It is a happy number.

It is a super-2 number, since 2×91909550455440² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2034229650 + ... + 2034274830.

Almost surely, 2^{91909550455440} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91909550455440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149168507461632).

91909550455440 is an abundant number, since it is smaller than the sum of its proper divisors (206427464467824).

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

91909550455440 is a wasteful number, since it uses less digits than its factorization.

91909550455440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49150 (or 49144 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 60.

The spelling of 91909550455440 in words is "ninety-one trillion, nine hundred nine billion, five hundred fifty million, four hundred fifty-five thousand, four hundred forty".