656143597 has 4 divisors (see below), whose sum is σ = 656598496. Its totient is φ = 655688700.

The previous prime is 656143573. The next prime is 656143603. The reversal of 656143597 is 795341656.

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 a de Polignac number, because none of the positive numbers 2^k-656143597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656143507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225279 + ... + 228172.

It is an arithmetic number, because the mean of its divisors is an integer number (164149624).

Almost surely, 2^656143597 is an apocalyptic number.

It is an amenable number.

656143597 is a deficient number, since it is larger than the sum of its proper divisors (454899).

656143597 is a wasteful number, since it uses less digits than its factorization.

656143597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454898.

The product of its digits is 680400, while the sum is 46.

The square root of 656143597 is about 25615.3000568020. The cubic root of 656143597 is about 868.9596923766.

The spelling of 656143597 in words is "six hundred fifty-six million, one hundred forty-three thousand, five hundred ninety-seven".