56657569 has 4 divisors (see below), whose sum is σ = 56720944. Its totient is φ = 56594196.

The previous prime is 56657567. The next prime is 56657609. The reversal of 56657569 is 96575665.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96575665 = 5 ⋅19315133.

It is a cyclic number.

It is not a de Polignac number, because 56657569 - 2¹ = 56657567 is a prime.

It is a super-2 number, since 2×56657569² = 6420160249979522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56657567) 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, 30327 + ... + 32140.

It is an arithmetic number, because the mean of its divisors is an integer number (14180236).

Almost surely, 2^56657569 is an apocalyptic number.

It is an amenable number.

56657569 is a deficient number, since it is larger than the sum of its proper divisors (63375).

56657569 is an equidigital number, since it uses as much as digits as its factorization.

56657569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63374.

The product of its digits is 1701000, while the sum is 49.

The square root of 56657569 is about 7527.1222256584. The cubic root of 56657569 is about 384.0778944447.

The spelling of 56657569 in words is "fifty-six million, six hundred fifty-seven thousand, five hundred sixty-nine".