81758653584 has 20 divisors (see below), whose sum is σ = 211209855216. Its totient is φ = 27252884512.

The previous prime is 81758653553. The next prime is 81758653601. The reversal of 81758653584 is 48535685718.

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, 851652594 + ... + 851652689.

Almost surely, 2^81758653584 is an apocalyptic number.

It is an amenable number.

81758653584 is an abundant number, since it is smaller than the sum of its proper divisors (129451201632).

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

81758653584 is a wasteful number, since it uses less digits than its factorization.

81758653584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703305294 (or 1703305288 counting only the distinct ones).

The product of its digits is 32256000, while the sum is 60.

The spelling of 81758653584 in words is "eighty-one billion, seven hundred fifty-eight million, six hundred fifty-three thousand, five hundred eighty-four".