656561061 has 24 divisors (see below), whose sum is σ = 1022505120. Its totient is φ = 403567776.

The previous prime is 656561057. The next prime is 656561071. The reversal of 656561061 is 160165656.

It is not a de Polignac number, because 656561061 - 2² = 656561057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656561011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116470 + ... + 121976.

It is an arithmetic number, because the mean of its divisors is an integer number (42604380).

Almost surely, 2^656561061 is an apocalyptic number.

It is an amenable number.

656561061 is a deficient number, since it is larger than the sum of its proper divisors (365944059).

656561061 is a wasteful number, since it uses less digits than its factorization.

656561061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6545 (or 6542 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 656561061 is about 25623.4474846770. The cubic root of 656561061 is about 869.1439419240.

The spelling of 656561061 in words is "six hundred fifty-six million, five hundred sixty-one thousand, sixty-one".