655253666 has 16 divisors (see below), whose sum is σ = 1022406840. Its totient is φ = 314576640.

The previous prime is 655253659. The next prime is 655253699. The reversal of 655253666 is 666352556.

It can be written as a sum of positive squares in 4 ways, for example, as 150577441 + 504676225 = 12271^2 + 22465^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20711 + ... + 41706.

Almost surely, 2^655253666 is an apocalyptic number.

655253666 is a deficient number, since it is larger than the sum of its proper divisors (367153174).

655253666 is a wasteful number, since it uses less digits than its factorization.

655253666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62629.

The product of its digits is 972000, while the sum is 44.

The square root of 655253666 is about 25597.9230798125. The cubic root of 655253666 is about 868.5666564356.

The spelling of 655253666 in words is "six hundred fifty-five million, two hundred fifty-three thousand, six hundred sixty-six".