91767997725 has 24 divisors (see below), whose sum is σ = 151731767712. Its totient is φ = 48940132800.

The previous prime is 91767997691. The next prime is 91767997753. The reversal of 91767997725 is 52779976719.

It is not a de Polignac number, because 91767997725 - 2⁸ = 91767997469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91767997725.

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 23 ways as a sum of consecutive naturals, for example, 2536614 + ... + 2572536.

It is an arithmetic number, because the mean of its divisors is an integer number (6322156988).

Almost surely, 2^91767997725 is an apocalyptic number.

It is an amenable number.

91767997725 is a deficient number, since it is larger than the sum of its proper divisors (59963769987).

91767997725 is a wasteful number, since it uses less digits than its factorization.

91767997725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69997 (or 69992 counting only the distinct ones).

The product of its digits is 105019740, while the sum is 69.

The spelling of 91767997725 in words is "ninety-one billion, seven hundred sixty-seven million, nine hundred ninety-seven thousand, seven hundred twenty-five".