91655782036 has 72 divisors (see below), whose sum is σ = 201049636200. Its totient is φ = 36239228928.

The previous prime is 91655781967. The next prime is 91655782103. The reversal of 91655782036 is 63028755619.

It can be written as a sum of positive squares in 4 ways, for example, as 22903795600 + 68751986436 = 151340^2 + 262206^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5069140 + ... + 5087188.

Almost surely, 2^91655782036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91655782036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100524818100).

91655782036 is an abundant number, since it is smaller than the sum of its proper divisors (109393854164).

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

91655782036 is a wasteful number, since it uses less digits than its factorization.

91655782036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20073 (or 20064 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 91655782036 in words is "ninety-one billion, six hundred fifty-five million, seven hundred eighty-two thousand, thirty-six".