51177657691 has 2 divisors, whose sum is σ = 51177657692. Its totient is φ = 51177657690.

The previous prime is 51177657659. The next prime is 51177657721. The reversal of 51177657691 is 19675677115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51177657691 - 2⁵ = 51177657659 is a prime.

It is not a weakly prime, because it can be changed into another prime (51177657631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25588828845 + 25588828846.

It is an arithmetic number, because the mean of its divisors is an integer number (25588828846).

Almost surely, 2^51177657691 is an apocalyptic number.

51177657691 is a deficient number, since it is larger than the sum of its proper divisors (1).

51177657691 is an equidigital number, since it uses as much as digits as its factorization.

51177657691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2778300, while the sum is 55.

The spelling of 51177657691 in words is "fifty-one billion, one hundred seventy-seven million, six hundred fifty-seven thousand, six hundred ninety-one".