91620165718 has 32 divisors (see below), whose sum is σ = 144592791552. Its totient is φ = 43455984000.

The previous prime is 91620165701. The next prime is 91620165731. The reversal of 91620165718 is 81756102619.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 11752830 + ... + 11760622.

It is an arithmetic number, because the mean of its divisors is an integer number (4518524736).

Almost surely, 2^91620165718 is an apocalyptic number.

91620165718 is a deficient number, since it is larger than the sum of its proper divisors (52972625834).

91620165718 is a wasteful number, since it uses less digits than its factorization.

91620165718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9900.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 91620165718 in words is "ninety-one billion, six hundred twenty million, one hundred sixty-five thousand, seven hundred eighteen".