91997366938 has 32 divisors (see below), whose sum is σ = 146383469568. Its totient is φ = 43291747200.

The previous prime is 91997366921. The next prime is 91997366941. The reversal of 91997366938 is 83966379919.

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, 748731 + ... + 862897.

It is an arithmetic number, because the mean of its divisors is an integer number (4574483424).

Almost surely, 2^91997366938 is an apocalyptic number.

91997366938 is a deficient number, since it is larger than the sum of its proper divisors (54386102630).

91997366938 is a wasteful number, since it uses less digits than its factorization.

91997366938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114558.

The product of its digits is 119042784, while the sum is 70.

The spelling of 91997366938 in words is "ninety-one billion, nine hundred ninety-seven million, three hundred sixty-six thousand, nine hundred thirty-eight".