97776131636 has 24 divisors (see below), whose sum is σ = 171553765320. Its totient is φ = 48760860672.

The previous prime is 97776131623. The next prime is 97776131641. The reversal of 97776131636 is 63613167779.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22381955236 + 75394176400 = 149606^2 + 274580^2 .

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, 5022770 + ... + 5042198.

It is an arithmetic number, because the mean of its divisors is an integer number (7148073555).

Almost surely, 2^97776131636 is an apocalyptic number.

It is an amenable number.

97776131636 is a deficient number, since it is larger than the sum of its proper divisors (73777633684).

97776131636 is a wasteful number, since it uses less digits than its factorization.

97776131636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22643 (or 22641 counting only the distinct ones).

The product of its digits is 6001128, while the sum is 56.

The spelling of 97776131636 in words is "ninety-seven billion, seven hundred seventy-six million, one hundred thirty-one thousand, six hundred thirty-six".