81696382619 has 2 divisors, whose sum is σ = 81696382620. Its totient is φ = 81696382618.

The previous prime is 81696382613. The next prime is 81696382709. The reversal of 81696382619 is 91628369618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81696382619 - 2¹² = 81696378523 is a prime.

It is a super-2 number, since 2×81696382619² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81696382613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40848191309 + 40848191310.

It is an arithmetic number, because the mean of its divisors is an integer number (40848191310).

Almost surely, 2^81696382619 is an apocalyptic number.

81696382619 is a deficient number, since it is larger than the sum of its proper divisors (1).

81696382619 is an equidigital number, since it uses as much as digits as its factorization.

81696382619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 59.

The spelling of 81696382619 in words is "eighty-one billion, six hundred ninety-six million, three hundred eighty-two thousand, six hundred nineteen".