131747765640 has 32 divisors (see below), whose sum is σ = 395243297280. Its totient is φ = 35132737472.

The previous prime is 131747765621. The next prime is 131747765641. The reversal of 131747765640 is 46567747131.

It is a super-2 number, since 2×131747765640² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131747765641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548948904 + ... + 548949143.

It is an arithmetic number, because the mean of its divisors is an integer number (12351353040).

Almost surely, 2^131747765640 is an apocalyptic number.

131747765640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131747765640 is an abundant number, since it is smaller than the sum of its proper divisors (263495531640).

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

131747765640 is a wasteful number, since it uses less digits than its factorization.

131747765640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097898061 (or 1097898057 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 51.

The spelling of 131747765640 in words is "one hundred thirty-one billion, seven hundred forty-seven million, seven hundred sixty-five thousand, six hundred forty".