81699022871 has 2 divisors, whose sum is σ = 81699022872. Its totient is φ = 81699022870.

The previous prime is 81699022787. The next prime is 81699022907. The reversal of 81699022871 is 17822099618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81699022871 - 2¹⁸ = 81698760727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81699021871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40849511435 + 40849511436.

It is an arithmetic number, because the mean of its divisors is an integer number (40849511436).

Almost surely, 2^81699022871 is an apocalyptic number.

81699022871 is a deficient number, since it is larger than the sum of its proper divisors (1).

81699022871 is an equidigital number, since it uses as much as digits as its factorization.

81699022871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 81699022871 in words is "eighty-one billion, six hundred ninety-nine million, twenty-two thousand, eight hundred seventy-one".