660660877 has 8 divisors (see below), whose sum is σ = 673595064. Its totient is φ = 647831808.

The previous prime is 660660859. The next prime is 660660883. The reversal of 660660877 is 778066066.

It can be written as a sum of positive squares in 4 ways, for example, as 428738436 + 231922441 = 20706^2 + 15229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660660877 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 (660660857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13528 + ... + 38785.

It is an arithmetic number, because the mean of its divisors is an integer number (84199383).

Almost surely, 2^660660877 is an apocalyptic number.

It is an amenable number.

660660877 is a deficient number, since it is larger than the sum of its proper divisors (12934187).

660660877 is a wasteful number, since it uses less digits than its factorization.

660660877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52559.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 660660877 is about 25703.3242402612. The cubic root of 660660877 is about 870.9492774041.

The spelling of 660660877 in words is "six hundred sixty million, six hundred sixty thousand, eight hundred seventy-seven".