51866680291 has 2 divisors, whose sum is σ = 51866680292. Its totient is φ = 51866680290.

The previous prime is 51866680279. The next prime is 51866680337. The reversal of 51866680291 is 19208666815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51866680291 - 2²⁷ = 51732462563 is a prime.

It is not a weakly prime, because it can be changed into another prime (51866620291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25933340145 + 25933340146.

It is an arithmetic number, because the mean of its divisors is an integer number (25933340146).

Almost surely, 2^51866680291 is an apocalyptic number.

51866680291 is a deficient number, since it is larger than the sum of its proper divisors (1).

51866680291 is an equidigital number, since it uses as much as digits as its factorization.

51866680291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 51866680291 in words is "fifty-one billion, eight hundred sixty-six million, six hundred eighty thousand, two hundred ninety-one".