81565625151419 has 2 divisors, whose sum is σ = 81565625151420. Its totient is φ = 81565625151418.

The previous prime is 81565625151359. The next prime is 81565625151457. The reversal of 81565625151419 is 91415152656518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81565625151419 - 2³⁶ = 81496905674683 is a prime.

It is a super-2 number, since 2×81565625151419² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81565625121419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40782812575709 + 40782812575710.

It is an arithmetic number, because the mean of its divisors is an integer number (40782812575710).

Almost surely, 2^{81565625151419} is an apocalyptic number.

81565625151419 is a deficient number, since it is larger than the sum of its proper divisors (1).

81565625151419 is an equidigital number, since it uses as much as digits as its factorization.

81565625151419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960000, while the sum is 59.

The spelling of 81565625151419 in words is "eighty-one trillion, five hundred sixty-five billion, six hundred twenty-five million, one hundred fifty-one thousand, four hundred nineteen".