655256666 has 4 divisors (see below), whose sum is σ = 982885002. Its totient is φ = 327628332.

The previous prime is 655256663. The next prime is 655256669. The reversal of 655256666 is 666652556.

655256666 = 7384² + 7385² + ... + 7395².

655256666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (655256663) and next prime (655256669).

It can be written as a sum of positive squares in only one way, i.e., 653876041 + 1380625 = 25571^2 + 1175^2 .

It is a super-2 number, since 2×655256666² = 858722596674871112, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 655256666.

It is not an unprimeable number, because it can be changed into a prime (655256663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163814165 + ... + 163814168.

Almost surely, 2^655256666 is an apocalyptic number.

655256666 is a deficient number, since it is larger than the sum of its proper divisors (327628336).

655256666 is a wasteful number, since it uses less digits than its factorization.

655256666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327628335.

The product of its digits is 1944000, while the sum is 47.

The square root of 655256666 is about 25597.9816782496. The cubic root of 655256666 is about 868.5679819761.

The spelling of 655256666 in words is "six hundred fifty-five million, two hundred fifty-six thousand, six hundred sixty-six".