81994938414353 has 8 divisors (see below), whose sum is σ = 82353749107200. Its totient is φ = 81636258852288.

The previous prime is 81994938414307. The next prime is 81994938414401. The reversal of 81994938414353 is 35341483949918.

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 81994938414353 - 2¹⁴ = 81994938397969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81994938419353) 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, 31529273 + ... + 34030646.

It is an arithmetic number, because the mean of its divisors is an integer number (10294218638400).

Almost surely, 2^{81994938414353} is an apocalyptic number.

It is an amenable number.

81994938414353 is a deficient number, since it is larger than the sum of its proper divisors (358810692847).

81994938414353 is a wasteful number, since it uses less digits than its factorization.

81994938414353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65565391.

The product of its digits is 403107840, while the sum is 71.

The spelling of 81994938414353 in words is "eighty-one trillion, nine hundred ninety-four billion, nine hundred thirty-eight million, four hundred fourteen thousand, three hundred fifty-three".