718455681761 has 2 divisors, whose sum is σ = 718455681762. Its totient is φ = 718455681760.

The previous prime is 718455681731. The next prime is 718455681799. The reversal of 718455681761 is 167186554817.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 572345206225 + 146110475536 = 756535^2 + 382244^2 .

It is a cyclic number.

It is not a de Polignac number, because 718455681761 - 2²⁶ = 718388572897 is a prime.

It is a super-2 number, since 2×718455681761² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 718455681761.

It is not a weakly prime, because it can be changed into another prime (718455681721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359227840880 + 359227840881.

It is an arithmetic number, because the mean of its divisors is an integer number (359227840881).

Almost surely, 2^718455681761 is an apocalyptic number.

It is an amenable number.

718455681761 is a deficient number, since it is larger than the sum of its proper divisors (1).

718455681761 is an equidigital number, since it uses as much as digits as its factorization.

718455681761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11289600, while the sum is 59.

The spelling of 718455681761 in words is "seven hundred eighteen billion, four hundred fifty-five million, six hundred eighty-one thousand, seven hundred sixty-one".