42796615681 has 2 divisors, whose sum is σ = 42796615682. Its totient is φ = 42796615680.

The previous prime is 42796615679. The next prime is 42796615703. The reversal of 42796615681 is 18651669724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36977367025 + 5819248656 = 192295^2 + 76284^2 .

It is a cyclic number.

It is not a de Polignac number, because 42796615681 - 2¹ = 42796615679 is a prime.

It is a super-2 number, since 2×42796615681² (a number of 22 digits) contains 22 as substring.

Together with 42796615679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42796615651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21398307840 + 21398307841.

It is an arithmetic number, because the mean of its divisors is an integer number (21398307841).

Almost surely, 2^42796615681 is an apocalyptic number.

It is an amenable number.

42796615681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42796615681 is an equidigital number, since it uses as much as digits as its factorization.

42796615681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 55.

The spelling of 42796615681 in words is "forty-two billion, seven hundred ninety-six million, six hundred fifteen thousand, six hundred eighty-one".