656550561 has 8 divisors (see below), whose sum is σ = 887730624. Its totient is φ = 431535440.

The previous prime is 656550547. The next prime is 656550563. The reversal of 656550561 is 165055656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656550561 - 2⁹ = 656550049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (656550563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1540986 + ... + 1541411.

It is an arithmetic number, because the mean of its divisors is an integer number (110966328).

Almost surely, 2^656550561 is an apocalyptic number.

It is an amenable number.

656550561 is a deficient number, since it is larger than the sum of its proper divisors (231180063).

656550561 is a wasteful number, since it uses less digits than its factorization.

656550561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3082471.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 656550561 is about 25623.2425933956. The cubic root of 656550561 is about 869.1393086611.

The spelling of 656550561 in words is "six hundred fifty-six million, five hundred fifty thousand, five hundred sixty-one".