660564407 has 16 divisors (see below), whose sum is σ = 703594080. Its totient is φ = 619046400.

The previous prime is 660564391. The next prime is 660564419. The reversal of 660564407 is 704465066.

It is a cyclic number.

It is not a de Polignac number, because 660564407 - 2⁴ = 660564391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660564467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249563 + ... + 252195.

It is an arithmetic number, because the mean of its divisors is an integer number (43974630).

Almost surely, 2^660564407 is an apocalyptic number.

660564407 is a deficient number, since it is larger than the sum of its proper divisors (43029673).

660564407 is a wasteful number, since it uses less digits than its factorization.

660564407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2914.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 660564407 is about 25701.4475662364. The cubic root of 660564407 is about 870.9068832048.

The spelling of 660564407 in words is "six hundred sixty million, five hundred sixty-four thousand, four hundred seven".