90931015217618 has 32 divisors (see below), whose sum is σ = 142396998451200. Its totient is φ = 43467301665216.

The previous prime is 90931015217599. The next prime is 90931015217657. The reversal of 90931015217618 is 81671251013909.

It is a self number, because there is not a number n which added to its sum of digits gives 90931015217618.

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, 2165879855 + ... + 2165921837.

It is an arithmetic number, because the mean of its divisors is an integer number (4449906201600).

Almost surely, 2^{90931015217618} is an apocalyptic number.

90931015217618 is a deficient number, since it is larger than the sum of its proper divisors (51465983233582).

90931015217618 is a wasteful number, since it uses less digits than its factorization.

90931015217618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64106.

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 90931015217618 in words is "ninety trillion, nine hundred thirty-one billion, fifteen million, two hundred seventeen thousand, six hundred eighteen".