81699022901 has 8 divisors (see below), whose sum is σ = 83502092160. Its totient is φ = 79898653408.

The previous prime is 81699022871. The next prime is 81699022907. The reversal of 81699022901 is 10922099618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81699022901 - 2¹⁸ = 81698760757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81699022907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613691 + ... + 734856.

It is an arithmetic number, because the mean of its divisors is an integer number (10437761520).

Almost surely, 2^81699022901 is an apocalyptic number.

It is an amenable number.

81699022901 is a deficient number, since it is larger than the sum of its proper divisors (1803069259).

81699022901 is a wasteful number, since it uses less digits than its factorization.

81699022901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349883.

The product of its (nonzero) digits is 139968, while the sum is 47.

The spelling of 81699022901 in words is "eighty-one billion, six hundred ninety-nine million, twenty-two thousand, nine hundred one".