91579137075 has 36 divisors (see below), whose sum is σ = 164298883008. Its totient is φ = 48761668800.

The previous prime is 91579137073. The next prime is 91579137079. The reversal of 91579137075 is 57073197519.

It is not a de Polignac number, because 91579137075 - 2¹ = 91579137073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91579137073) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 198696 + ... + 471845.

Almost surely, 2^91579137075 is an apocalyptic number.

91579137075 is a deficient number, since it is larger than the sum of its proper divisors (72719745933).

91579137075 is a wasteful number, since it uses less digits than its factorization.

91579137075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671164 (or 671156 counting only the distinct ones).

The product of its (nonzero) digits is 2083725, while the sum is 54.

The spelling of 91579137075 in words is "ninety-one billion, five hundred seventy-nine million, one hundred thirty-seven thousand, seventy-five".