91166956397907 has 16 divisors (see below), whose sum is σ = 130925049615360. Its totient is φ = 56094749248032.

The previous prime is 91166956397903. The next prime is 91166956397939. The reversal of 91166956397907 is 70979365966119.

It is a happy number.

It is not a de Polignac number, because 91166956397907 - 2² = 91166956397903 is a prime.

It is a super-2 number, since 2×91166956397907² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91166956397903) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 166246723 + ... + 166794204.

It is an arithmetic number, because the mean of its divisors is an integer number (8182815600960).

Almost surely, 2^{91166956397907} is an apocalyptic number.

91166956397907 is a deficient number, since it is larger than the sum of its proper divisors (39758093217453).

91166956397907 is a wasteful number, since it uses less digits than its factorization.

91166956397907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333047962.

The product of its (nonzero) digits is 1041624360, while the sum is 78.

The spelling of 91166956397907 in words is "ninety-one trillion, one hundred sixty-six billion, nine hundred fifty-six million, three hundred ninety-seven thousand, nine hundred seven".