81676334863 has 2 divisors, whose sum is σ = 81676334864. Its totient is φ = 81676334862.

The previous prime is 81676334737. The next prime is 81676334923. The reversal of 81676334863 is 36843367618.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81676334863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81676337863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838167431 + 40838167432.

It is an arithmetic number, because the mean of its divisors is an integer number (40838167432).

Almost surely, 2^81676334863 is an apocalyptic number.

81676334863 is a deficient number, since it is larger than the sum of its proper divisors (1).

81676334863 is an equidigital number, since it uses as much as digits as its factorization.

81676334863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 55.

The spelling of 81676334863 in words is "eighty-one billion, six hundred seventy-six million, three hundred thirty-four thousand, eight hundred sixty-three".