51460477661 has 2 divisors, whose sum is σ = 51460477662. Its totient is φ = 51460477660.

The previous prime is 51460477619. The next prime is 51460477669. The reversal of 51460477661 is 16677406415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35406067225 + 16054410436 = 188165^2 + 126706^2 .

It is a cyclic number.

It is not a de Polignac number, because 51460477661 - 2¹⁴ = 51460461277 is a prime.

It is a super-2 number, since 2×51460477661² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51460477669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25730238830 + 25730238831.

It is an arithmetic number, because the mean of its divisors is an integer number (25730238831).

Almost surely, 2^51460477661 is an apocalyptic number.

It is an amenable number.

51460477661 is a deficient number, since it is larger than the sum of its proper divisors (1).

51460477661 is an equidigital number, since it uses as much as digits as its factorization.

51460477661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 51460477661 in words is "fifty-one billion, four hundred sixty million, four hundred seventy-seven thousand, six hundred sixty-one".