91018899008 has 56 divisors (see below), whose sum is σ = 181662750720. Its totient is φ = 45246389760.

The previous prime is 91018898947. The next prime is 91018899019. The reversal of 91018899008 is 80099881019.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7895873 + ... + 7907391.

Almost surely, 2^91018899008 is an apocalyptic number.

It is an amenable number.

91018899008 is a deficient number, since it is larger than the sum of its proper divisors (90643851712).

91018899008 is a wasteful number, since it uses less digits than its factorization.

91018899008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12235 (or 12225 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 53.

The spelling of 91018899008 in words is "ninety-one billion, eighteen million, eight hundred ninety-nine thousand, eight".