7801741681 has 2 divisors, whose sum is σ = 7801741682. Its totient is φ = 7801741680.

The previous prime is 7801741589. The next prime is 7801741687. The reversal of 7801741681 is 1861471087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4794316081 + 3007425600 = 69241^2 + 54840^2 .

It is a cyclic number.

It is not a de Polignac number, because 7801741681 - 2²¹ = 7799644529 is a prime.

It is a super-2 number, since 2×7801741681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7801741687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900870840 + 3900870841.

It is an arithmetic number, because the mean of its divisors is an integer number (3900870841).

Almost surely, 2^7801741681 is an apocalyptic number.

It is an amenable number.

7801741681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7801741681 is an equidigital number, since it uses as much as digits as its factorization.

7801741681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 43.

The square root of 7801741681 is about 88327.4684398913. The cubic root of 7801741681 is about 1983.3400823221.

The spelling of 7801741681 in words is "seven billion, eight hundred one million, seven hundred forty-one thousand, six hundred eighty-one".