660704405 has 16 divisors (see below), whose sum is σ = 848925360. Its totient is φ = 491876352.

The previous prime is 660704399. The next prime is 660704411. The reversal of 660704405 is 504407066.

It is an interprime number because it is at equal distance from previous prime (660704399) and next prime (660704411).

It can be written as a sum of positive squares in 8 ways, for example, as 41242084 + 619462321 = 6422^2 + 24889^2 .

It is a cyclic number.

It is not a de Polignac number, because 660704405 - 2⁴ = 660704389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36104 + ... + 51233.

It is an arithmetic number, because the mean of its divisors is an integer number (53057835).

Almost surely, 2^660704405 is an apocalyptic number.

It is an amenable number.

660704405 is a deficient number, since it is larger than the sum of its proper divisors (188220955).

660704405 is a wasteful number, since it uses less digits than its factorization.

660704405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87448.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 660704405 is about 25704.1709650399. The cubic root of 660704405 is about 870.9684046392.

The spelling of 660704405 in words is "six hundred sixty million, seven hundred four thousand, four hundred five".