91149080020 has 24 divisors (see below), whose sum is σ = 191895233544. Its totient is φ = 36367790976.

The previous prime is 91149079997. The next prime is 91149080069. The reversal of 91149080020 is 2008094119.

It can be written as a sum of positive squares in 4 ways, for example, as 24541728964 + 66607351056 = 156658^2 + 258084^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5731927 + ... + 5747806.

It is an arithmetic number, because the mean of its divisors is an integer number (7995634731).

Almost surely, 2^91149080020 is an apocalyptic number.

It is an amenable number.

91149080020 is an abundant number, since it is smaller than the sum of its proper divisors (100746153524).

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

91149080020 is a wasteful number, since it uses less digits than its factorization.

91149080020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11480139 (or 11480137 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 91149080020 in words is "ninety-one billion, one hundred forty-nine million, eighty thousand, twenty".