666512655 has 32 divisors (see below), whose sum is σ = 1113393600. Its totient is φ = 340042752.

The previous prime is 666512551. The next prime is 666512663. The reversal of 666512655 is 556215666.

It is not a de Polignac number, because 666512655 - 2²⁴ = 649735439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40387 + ... + 54443.

It is an arithmetic number, because the mean of its divisors is an integer number (34793550).

Almost surely, 2^666512655 is an apocalyptic number.

666512655 is a deficient number, since it is larger than the sum of its proper divisors (446880945).

666512655 is a wasteful number, since it uses less digits than its factorization.

666512655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14203.

The product of its digits is 324000, while the sum is 42.

The square root of 666512655 is about 25816.9063793476. The cubic root of 666512655 is about 873.5131887637.

The spelling of 666512655 in words is "six hundred sixty-six million, five hundred twelve thousand, six hundred fifty-five".