91535560544 has 24 divisors (see below), whose sum is σ = 183610838880. Its totient is φ = 44904236416.

The previous prime is 91535560541. The next prime is 91535560619. The reversal of 91535560544 is 44506553519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91535560541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26984024 + ... + 26987415.

It is an arithmetic number, because the mean of its divisors is an integer number (7650451620).

Almost surely, 2^91535560544 is an apocalyptic number.

It is an amenable number.

91535560544 is an abundant number, since it is smaller than the sum of its proper divisors (92075278336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91535560544 is a wasteful number, since it uses less digits than its factorization.

91535560544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53971502 (or 53971494 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 91535560544 in words is "ninety-one billion, five hundred thirty-five million, five hundred sixty thousand, five hundred forty-four".