51131065266431 has 2 divisors, whose sum is σ = 51131065266432. Its totient is φ = 51131065266430.

The previous prime is 51131065266409. The next prime is 51131065266467. The reversal of 51131065266431 is 13466256013115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51131065266431 - 2¹⁸ = 51131065004287 is a prime.

It is a super-2 number, since 2×51131065266431² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51131065266031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25565532633215 + 25565532633216.

It is an arithmetic number, because the mean of its divisors is an integer number (25565532633216).

Almost surely, 2^{51131065266431} is an apocalyptic number.

51131065266431 is a deficient number, since it is larger than the sum of its proper divisors (1).

51131065266431 is an equidigital number, since it uses as much as digits as its factorization.

51131065266431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 51131065266431 in words is "fifty-one trillion, one hundred thirty-one billion, sixty-five million, two hundred sixty-six thousand, four hundred thirty-one".