131376440644 has 12 divisors (see below), whose sum is σ = 236122521964. Its totient is φ = 63912862944.

The previous prime is 131376440621. The next prime is 131376440779. The reversal of 131376440644 is 446044673131.

It can be written as a sum of positive squares in 2 ways, for example, as 63422378244 + 67954062400 = 251838^2 + 260680^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131376440644.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443839179 + ... + 443839474.

Almost surely, 2^131376440644 is an apocalyptic number.

It is an amenable number.

131376440644 is a deficient number, since it is larger than the sum of its proper divisors (104746081320).

131376440644 is a wasteful number, since it uses less digits than its factorization.

131376440644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887678694 (or 887678692 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 43.

The spelling of 131376440644 in words is "one hundred thirty-one billion, three hundred seventy-six million, four hundred forty thousand, six hundred forty-four".