7870481681 has 2 divisors, whose sum is σ = 7870481682. Its totient is φ = 7870481680.

The previous prime is 7870481669. The next prime is 7870481699. The reversal of 7870481681 is 1861840787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6853190656 + 1017291025 = 82784^2 + 31895^2 .

It is an emirp because it is prime and its reverse (1861840787) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7870481681 is a prime.

It is a super-2 number, since 2×7870481681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7870481881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3935240840 + 3935240841.

It is an arithmetic number, because the mean of its divisors is an integer number (3935240841).

Almost surely, 2^7870481681 is an apocalyptic number.

It is an amenable number.

7870481681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7870481681 is an equidigital number, since it uses as much as digits as its factorization.

7870481681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 602112, while the sum is 50.

The square root of 7870481681 is about 88715.7352502925. The cubic root of 7870481681 is about 1989.1480306291.

The spelling of 7870481681 in words is "seven billion, eight hundred seventy million, four hundred eighty-one thousand, six hundred eighty-one".