91957260585 has 16 divisors (see below), whose sum is σ = 147136114944. Its totient is φ = 49042372992.

The previous prime is 91957260581. The next prime is 91957260617. The reversal of 91957260585 is 58506275919.

It is a happy number.

It is not a de Polignac number, because 91957260585 - 2² = 91957260581 is a prime.

It is a super-2 number, since 2×91957260585² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91957260581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560749 + ... + 705941.

It is an arithmetic number, because the mean of its divisors is an integer number (9196007184).

Almost surely, 2^91957260585 is an apocalyptic number.

It is an amenable number.

91957260585 is a deficient number, since it is larger than the sum of its proper divisors (55178854359).

91957260585 is a wasteful number, since it uses less digits than its factorization.

91957260585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187424.

The product of its (nonzero) digits is 6804000, while the sum is 57.

The spelling of 91957260585 in words is "ninety-one billion, nine hundred fifty-seven million, two hundred sixty thousand, five hundred eighty-five".