81565625151359 has 2 divisors, whose sum is σ = 81565625151360. Its totient is φ = 81565625151358.

The previous prime is 81565625151259. The next prime is 81565625151419. The reversal of 81565625151359 is 95315152656518.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81565625151359 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81565625151259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40782812575679 + 40782812575680.

It is an arithmetic number, because the mean of its divisors is an integer number (40782812575680).

Almost surely, 2^{81565625151359} is an apocalyptic number.

81565625151359 is a deficient number, since it is larger than the sum of its proper divisors (1).

81565625151359 is an equidigital number, since it uses as much as digits as its factorization.

81565625151359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600000, while the sum is 62.

The spelling of 81565625151359 in words is "eighty-one trillion, five hundred sixty-five billion, six hundred twenty-five million, one hundred fifty-one thousand, three hundred fifty-nine".