668032645725 has 36 divisors (see below), whose sum is σ = 1207109418996. Its totient is φ = 353131107840.

The previous prime is 668032645699. The next prime is 668032645747. The reversal of 668032645725 is 527546230866.

668032645725 is a `hidden beast` number, since 6 + 6 + 8 + 0 + 3 + 2 + 64 + 572 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 17683946361 + 650348699364 = 132981^2 + 806442^2 .

It is not a de Polignac number, because 668032645725 - 2⁷ = 668032645597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13111894 + ... + 13162743.

Almost surely, 2^668032645725 is an apocalyptic number.

It is an amenable number.

668032645725 is a deficient number, since it is larger than the sum of its proper divisors (539076773271).

668032645725 is a wasteful number, since it uses less digits than its factorization.

668032645725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26274766 (or 26274758 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 54.

The spelling of 668032645725 in words is "six hundred sixty-eight billion, thirty-two million, six hundred forty-five thousand, seven hundred twenty-five".