689660637696 has 60 divisors (see below), whose sum is σ = 1990407309462. Its totient is φ = 229886877696.

The previous prime is 689660637667. The next prime is 689660637767. The reversal of 689660637696 is 696736066986.

689660637696 is a `hidden beast` number, since 6 + 8 + 9 + 6 + 606 + 3 + 7 + 6 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 398837719296 + 290822918400 = 631536^2 + 539280^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74828361 + ... + 74837576.

Almost surely, 2^689660637696 is an apocalyptic number.

It is an amenable number.

689660637696 is an abundant number, since it is smaller than the sum of its proper divisors (1300746671766).

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

689660637696 is a wasteful number, since it uses less digits than its factorization.

689660637696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149665961 (or 149665942 counting only the distinct ones).

The product of its (nonzero) digits is 634894848, while the sum is 72.

The spelling of 689660637696 in words is "six hundred eighty-nine billion, six hundred sixty million, six hundred thirty-seven thousand, six hundred ninety-six".