689555120994 has 24 divisors (see below), whose sum is σ = 1501620042780. Its totient is φ = 228684945888.

The previous prime is 689555120983. The next prime is 689555121001. The reversal of 689555120994 is 499021555986.

689555120994 is a `hidden beast` number, since 68 + 9 + 55 + 512 + 0 + 9 + 9 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 614005452225 + 75549668769 = 783585^2 + 274863^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97226449 + ... + 97233540.

Almost surely, 2^689555120994 is an apocalyptic number.

689555120994 is an abundant number, since it is smaller than the sum of its proper divisors (812064921786).

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

689555120994 is a wasteful number, since it uses less digits than its factorization.

689555120994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194460194 (or 194460191 counting only the distinct ones).

The product of its (nonzero) digits is 34992000, while the sum is 63.

The spelling of 689555120994 in words is "six hundred eighty-nine billion, five hundred fifty-five million, one hundred twenty thousand, nine hundred ninety-four".