660413775 has 24 divisors (see below), whose sum is σ = 1247868544. Its totient is φ = 301903200.

The previous prime is 660413759. The next prime is 660413791. The reversal of 660413775 is 577314066.

It is an interprime number because it is at equal distance from previous prime (660413759) and next prime (660413791).

It is not a de Polignac number, because 660413775 - 2⁴ = 660413759 is a prime.

It is a super-2 number, since 2×660413775² = 872292708419501250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 628441 + ... + 629490.

Almost surely, 2^660413775 is an apocalyptic number.

660413775 is a deficient number, since it is larger than the sum of its proper divisors (587454769).

660413775 is a wasteful number, since it uses less digits than its factorization.

660413775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257951 (or 1257946 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 660413775 is about 25698.5169805575. The cubic root of 660413775 is about 870.8406790027.

The spelling of 660413775 in words is "six hundred sixty million, four hundred thirteen thousand, seven hundred seventy-five".