91163808080 has 40 divisors (see below), whose sum is σ = 216885067872. Its totient is φ = 35617486464.

The previous prime is 91163808013. The next prime is 91163808119. The reversal of 91163808080 is 8080836119.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 13247114 + ... + 13253993.

Almost surely, 2^91163808080 is an apocalyptic number.

It is an amenable number.

91163808080 is an abundant number, since it is smaller than the sum of its proper divisors (125721259792).

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

91163808080 is a wasteful number, since it uses less digits than its factorization.

91163808080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26501163 (or 26501157 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The spelling of 91163808080 in words is "ninety-one billion, one hundred sixty-three million, eight hundred eight thousand, eighty".