7906607516581 has 2 divisors, whose sum is σ = 7906607516582. Its totient is φ = 7906607516580.

The previous prime is 7906607516579. The next prime is 7906607516653. The reversal of 7906607516581 is 1856157066097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5308111876356 + 2598495640225 = 2303934^2 + 1611985^2 .

It is a cyclic number.

It is not a de Polignac number, because 7906607516581 - 2¹ = 7906607516579 is a prime.

It is a super-2 number, since 2×7906607516581² (a number of 27 digits) contains 22 as substring.

Together with 7906607516579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7906607519581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3953303758290 + 3953303758291.

It is an arithmetic number, because the mean of its divisors is an integer number (3953303758291).

Almost surely, 2^{7906607516581} is an apocalyptic number.

It is an amenable number.

7906607516581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7906607516581 is an equidigital number, since it uses as much as digits as its factorization.

7906607516581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19051200, while the sum is 61.

The spelling of 7906607516581 in words is "seven trillion, nine hundred six billion, six hundred seven million, five hundred sixteen thousand, five hundred eighty-one".