656611051 has 2 divisors, whose sum is σ = 656611052. Its totient is φ = 656611050.

The previous prime is 656611037. The next prime is 656611141. The reversal of 656611051 is 150116656.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656611051 is a prime.

It is a super-2 number, since 2×656611051² = 862276144590649202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656611951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328305525 + 328305526.

It is an arithmetic number, because the mean of its divisors is an integer number (328305526).

Almost surely, 2^656611051 is an apocalyptic number.

656611051 is a deficient number, since it is larger than the sum of its proper divisors (1).

656611051 is an equidigital number, since it uses as much as digits as its factorization.

656611051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 656611051 is about 25624.4229398439. The cubic root of 656611051 is about 869.1659999907.

The spelling of 656611051 in words is "six hundred fifty-six million, six hundred eleven thousand, fifty-one".