91080377308816 has 405 divisors, whose sum is σ = 214802448378651. Its totient is φ = 37303428524544.

The previous prime is 91080377308787. The next prime is 91080377308841. The reversal of 91080377308816 is 61880377308019.

The square root of 91080377308816 is 9543604.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 15916748576400 + 75163628732416 = 3989580^2 + 8669696^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 835599791770 + ... + 835599791878.

Almost surely, 2^{91080377308816} is an apocalyptic number.

91080377308816 is the 9543604-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91080377308816

91080377308816 is an abundant number, since it is smaller than the sum of its proper divisors (123722071069835).

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

91080377308816 is an equidigital number, since it uses as much as digits as its factorization.

91080377308816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 61.

The spelling of 91080377308816 in words is "ninety-one trillion, eighty billion, three hundred seventy-seven million, three hundred eight thousand, eight hundred sixteen".