681625231751 has 2 divisors, whose sum is σ = 681625231752. Its totient is φ = 681625231750.

The previous prime is 681625231723. The next prime is 681625231787. The reversal of 681625231751 is 157132526186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681625231751 - 2¹⁸ = 681624969607 is a prime.

It is a super-2 number, since 2×681625231751² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 681625231696 and 681625231705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681625231151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340812615875 + 340812615876.

It is an arithmetic number, because the mean of its divisors is an integer number (340812615876).

Almost surely, 2^681625231751 is an apocalyptic number.

681625231751 is a deficient number, since it is larger than the sum of its proper divisors (1).

681625231751 is an equidigital number, since it uses as much as digits as its factorization.

681625231751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 47.

The spelling of 681625231751 in words is "six hundred eighty-one billion, six hundred twenty-five million, two hundred thirty-one thousand, seven hundred fifty-one".