91166956397898 has 32 divisors (see below), whose sum is σ = 185992029617280. Its totient is φ = 29782896298560.

The previous prime is 91166956397887. The next prime is 91166956397903. The reversal of 91166956397898 is 89879365966119.

It is a super-2 number, since 2×91166956397898² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449519638 + ... + 449722401.

It is an arithmetic number, because the mean of its divisors is an integer number (5812250925540).

Almost surely, 2^{91166956397898} is an apocalyptic number.

91166956397898 is an abundant number, since it is smaller than the sum of its proper divisors (94825073219382).

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

91166956397898 is a wasteful number, since it uses less digits than its factorization.

91166956397898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899242382.

The product of its digits is 9523422720, while the sum is 87.

The spelling of 91166956397898 in words is "ninety-one trillion, one hundred sixty-six billion, nine hundred fifty-six million, three hundred ninety-seven thousand, eight hundred ninety-eight".