81369877612799 has 8 divisors (see below), whose sum is σ = 83569701119520. Its totient is φ = 79170087665376.

The previous prime is 81369877612787. The next prime is 81369877612883. The reversal of 81369877612799 is 99721677896318.

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 81369877612799 - 2⁴⁰ = 80270365985023 is a prime.

It is a super-2 number, since 2×81369877612799² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81369877612739) 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, 3435944 + ... + 13211565.

It is an arithmetic number, because the mean of its divisors is an integer number (10446212639940).

Almost surely, 2^{81369877612799} is an apocalyptic number.

81369877612799 is a deficient number, since it is larger than the sum of its proper divisors (2199823506721).

81369877612799 is a wasteful number, since it uses less digits than its factorization.

81369877612799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16779649.

The product of its digits is 3456649728, while the sum is 83.

The spelling of 81369877612799 in words is "eighty-one trillion, three hundred sixty-nine billion, eight hundred seventy-seven million, six hundred twelve thousand, seven hundred ninety-nine".