91583857625 has 32 divisors (see below), whose sum is σ = 126090959904. Its totient is φ = 65981568000.

The previous prime is 91583857609. The next prime is 91583857637. The reversal of 91583857625 is 52675838519.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 91544368969 + 39488656 = 302563^2 + 6284^2 .

It is not a de Polignac number, because 91583857625 - 2⁴ = 91583857609 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 620684 + ... + 753933.

It is an arithmetic number, because the mean of its divisors is an integer number (3940342497).

Almost surely, 2^91583857625 is an apocalyptic number.

It is an amenable number.

91583857625 is a deficient number, since it is larger than the sum of its proper divisors (34507102279).

91583857625 is a wasteful number, since it uses less digits than its factorization.

91583857625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374686 (or 1374676 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 59.

The spelling of 91583857625 in words is "ninety-one billion, five hundred eighty-three million, eight hundred fifty-seven thousand, six hundred twenty-five".