656670555 has 48 divisors (see below), whose sum is σ = 1173934944. Its totient is φ = 339356160.

The previous prime is 656670529. The next prime is 656670559. The reversal of 656670555 is 555076656.

It is not a de Polignac number, because 656670555 - 2⁵ = 656670523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 656670555.

It is not an unprimeable number, because it can be changed into a prime (656670559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 288532 + ... + 290798.

It is an arithmetic number, because the mean of its divisors is an integer number (24456978).

Almost surely, 2^656670555 is an apocalyptic number.

656670555 is a deficient number, since it is larger than the sum of its proper divisors (517264389).

656670555 is a wasteful number, since it uses less digits than its factorization.

656670555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2476 (or 2473 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 45.

The square root of 656670555 is about 25625.5839933454. The cubic root of 656670555 is about 869.1922546465.

The spelling of 656670555 in words is "six hundred fifty-six million, six hundred seventy thousand, five hundred fifty-five".