91939155251955 has 96 divisors (see below), whose sum is σ = 164649107234304. Its totient is φ = 43766346624000.

The previous prime is 91939155251953. The next prime is 91939155251959. The reversal of 91939155251955 is 55915255193919.

It is not a de Polignac number, because 91939155251955 - 2¹ = 91939155251953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91939155251955.

It is not an unprimeable number, because it can be changed into a prime (91939155251953) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 29576272 + ... + 32536658.

It is an arithmetic number, because the mean of its divisors is an integer number (1715094867024).

Almost surely, 2^{91939155251955} is an apocalyptic number.

91939155251955 is a deficient number, since it is larger than the sum of its proper divisors (72709951982349).

91939155251955 is a wasteful number, since it uses less digits than its factorization.

91939155251955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960729 (or 2960718 counting only the distinct ones).

The product of its digits is 123018750, while the sum is 69.

The spelling of 91939155251955 in words is "ninety-one trillion, nine hundred thirty-nine billion, one hundred fifty-five million, two hundred fifty-one thousand, nine hundred fifty-five".