656166661727 has 2 divisors, whose sum is σ = 656166661728. Its totient is φ = 656166661726.

The previous prime is 656166661637. The next prime is 656166661789. The reversal of 656166661727 is 727166661656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656166661727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656166661427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328083330863 + 328083330864.

It is an arithmetic number, because the mean of its divisors is an integer number (328083330864).

Almost surely, 2^656166661727 is an apocalyptic number.

656166661727 is a deficient number, since it is larger than the sum of its proper divisors (1).

656166661727 is an equidigital number, since it uses as much as digits as its factorization.

656166661727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 59.

The spelling of 656166661727 in words is "six hundred fifty-six billion, one hundred sixty-six million, six hundred sixty-one thousand, seven hundred twenty-seven".