91418840618 has 8 divisors (see below), whose sum is σ = 156718012512. Its totient is φ = 39179503116.

The previous prime is 91418840609. The next prime is 91418840663. The reversal of 91418840618 is 81604881419.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3264958580 + ... + 3264958607.

It is an arithmetic number, because the mean of its divisors is an integer number (19589751564).

Almost surely, 2^91418840618 is an apocalyptic number.

91418840618 is a deficient number, since it is larger than the sum of its proper divisors (65299171894).

91418840618 is a wasteful number, since it uses less digits than its factorization.

91418840618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6529917196.

The product of its (nonzero) digits is 442368, while the sum is 50.

The spelling of 91418840618 in words is "ninety-one billion, four hundred eighteen million, eight hundred forty thousand, six hundred eighteen".