80637515640 has 96 divisors (see below), whose sum is σ = 285896660400. Its totient is φ = 19548487680.

The previous prime is 80637515633. The next prime is 80637515663. The reversal of 80637515640 is 4651573608.

80637515640 is a `hidden beast` number, since 8 + 0 + 6 + 37 + 51 + 564 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10177545 + ... + 10185464.

Almost surely, 2^80637515640 is an apocalyptic number.

It is an amenable number.

80637515640 is an abundant number, since it is smaller than the sum of its proper divisors (205259144760).

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

80637515640 is a wasteful number, since it uses less digits than its factorization.

80637515640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20363037 (or 20363030 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 80637515640 in words is "eighty billion, six hundred thirty-seven million, five hundred fifteen thousand, six hundred forty".