689188904825 has 12 divisors (see below), whose sum is σ = 854614227900. Its totient is φ = 551338229760.

The previous prime is 689188904819. The next prime is 689188904843. The reversal of 689188904825 is 528409881986.

It can be written as a sum of positive squares in 6 ways, for example, as 166396278889 + 522792625936 = 407917^2 + 723044^2 .

It is not a de Polignac number, because 689188904825 - 2¹⁴ = 689188888441 is a prime.

It is a hoax number, since the sum of its digits (68) coincides with the sum of the digits of its distinct prime factors.

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, 851897 + ... + 1450553.

It is an arithmetic number, because the mean of its divisors is an integer number (71217852325).

Almost surely, 2^689188904825 is an apocalyptic number.

It is an amenable number.

689188904825 is a deficient number, since it is larger than the sum of its proper divisors (165425323075).

689188904825 is a wasteful number, since it uses less digits than its factorization.

689188904825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644716 (or 644711 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 68.

The spelling of 689188904825 in words is "six hundred eighty-nine billion, one hundred eighty-eight million, nine hundred four thousand, eight hundred twenty-five".