91668518425 has 24 divisors (see below), whose sum is σ = 127353938112. Its totient is φ = 64866168000.

The previous prime is 91668518407. The next prime is 91668518437. The reversal of 91668518425 is 52481586619.

It is not a de Polignac number, because 91668518425 - 2¹³ = 91668510233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4494421 + ... + 4514770.

It is an arithmetic number, because the mean of its divisors is an integer number (5306414088).

Almost surely, 2^91668518425 is an apocalyptic number.

It is an amenable number.

91668518425 is a deficient number, since it is larger than the sum of its proper divisors (35685419687).

91668518425 is a wasteful number, since it uses less digits than its factorization.

91668518425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9009249 (or 9009244 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 55.

The spelling of 91668518425 in words is "ninety-one billion, six hundred sixty-eight million, five hundred eighteen thousand, four hundred twenty-five".