655972669 has 4 divisors (see below), whose sum is σ = 715606560. Its totient is φ = 596338780.

The previous prime is 655972661. The next prime is 655972729. The reversal of 655972669 is 966279556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655972669 - 2³ = 655972661 is a prime.

It is a super-2 number, since 2×655972669² = 860600284949967122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655972661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29816929 + ... + 29816950.

It is an arithmetic number, because the mean of its divisors is an integer number (178901640).

Almost surely, 2^655972669 is an apocalyptic number.

It is an amenable number.

655972669 is a deficient number, since it is larger than the sum of its proper divisors (59633891).

655972669 is a wasteful number, since it uses less digits than its factorization.

655972669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59633890.

The product of its digits is 6123600, while the sum is 55.

The square root of 655972669 is about 25611.9633960382. The cubic root of 655972669 is about 868.8842300122.

The spelling of 655972669 in words is "six hundred fifty-five million, nine hundred seventy-two thousand, six hundred sixty-nine".