666651255 has 16 divisors (see below), whose sum is σ = 1073189760. Its totient is φ = 353364768.

The previous prime is 666651253. The next prime is 666651283. The reversal of 666651255 is 552156666.

It is not a de Polignac number, because 666651255 - 2¹ = 666651253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666651253) 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, 133885 + ... + 138774.

It is an arithmetic number, because the mean of its divisors is an integer number (67074360).

Almost surely, 2^666651255 is an apocalyptic number.

666651255 is a deficient number, since it is larger than the sum of its proper divisors (406538505).

666651255 is a wasteful number, since it uses less digits than its factorization.

666651255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272830.

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

The square root of 666651255 is about 25819.5905273496. The cubic root of 666651255 is about 873.5737330190.

The spelling of 666651255 in words is "six hundred sixty-six million, six hundred fifty-one thousand, two hundred fifty-five".