666464725 has 12 divisors (see below), whose sum is σ = 826749540. Its totient is φ = 532956800.

The previous prime is 666464723. The next prime is 666464741. The reversal of 666464725 is 527464666.

It can be written as a sum of positive squares in 6 ways, for example, as 105390756 + 561073969 = 10266^2 + 23687^2 .

It is not a de Polignac number, because 666464725 - 2¹ = 666464723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666464723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93591 + ... + 100459.

It is an arithmetic number, because the mean of its divisors is an integer number (68895795).

Almost surely, 2^666464725 is an apocalyptic number.

It is an amenable number.

666464725 is a deficient number, since it is larger than the sum of its proper divisors (160284815).

666464725 is a wasteful number, since it uses less digits than its factorization.

666464725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10760 (or 10755 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 46.

The square root of 666464725 is about 25815.9780949706. The cubic root of 666464725 is about 873.4922496810.

The spelling of 666464725 in words is "six hundred sixty-six million, four hundred sixty-four thousand, seven hundred twenty-five".