91606644767440 has 80 divisors (see below), whose sum is σ = 232349573943360. Its totient is φ = 33311247503360.

The previous prime is 91606644767437. The next prime is 91606644767459. The reversal of 91606644767440 is 4476744660619.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140216256 + ... + 140868064.

It is an arithmetic number, because the mean of its divisors is an integer number (2904369674292).

Almost surely, 2^{91606644767440} is an apocalyptic number.

It is an amenable number.

91606644767440 is an abundant number, since it is smaller than the sum of its proper divisors (140742929175920).

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

91606644767440 is a wasteful number, since it uses less digits than its factorization.

91606644767440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811540 (or 811534 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 64.

The spelling of 91606644767440 in words is "ninety-one trillion, six hundred six billion, six hundred forty-four million, seven hundred sixty-seven thousand, four hundred forty".