81696933859 has 2 divisors, whose sum is σ = 81696933860. Its totient is φ = 81696933858.

The previous prime is 81696933841. The next prime is 81696933889. The reversal of 81696933859 is 95833969618.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81696933859 - 2¹⁷ = 81696802787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81696933794 and 81696933803.

It is not a weakly prime, because it can be changed into another prime (81696933809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40848466929 + 40848466930.

It is an arithmetic number, because the mean of its divisors is an integer number (40848466930).

Almost surely, 2^81696933859 is an apocalyptic number.

81696933859 is a deficient number, since it is larger than the sum of its proper divisors (1).

81696933859 is an equidigital number, since it uses as much as digits as its factorization.

81696933859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75582720, while the sum is 67.

The spelling of 81696933859 in words is "eighty-one billion, six hundred ninety-six million, nine hundred thirty-three thousand, eight hundred fifty-nine".