81794372353 has 4 divisors (see below), whose sum is σ = 81797943508. Its totient is φ = 81790801200.

The previous prime is 81794372333. The next prime is 81794372393. The reversal of 81794372353 is 35327349718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25538596864 + 56255775489 = 159808^2 + 237183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81794372353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81794372353.

It is not an unprimeable number, because it can be changed into a prime (81794372333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750998 + ... + 1797103.

It is an arithmetic number, because the mean of its divisors is an integer number (20449485877).

Almost surely, 2^81794372353 is an apocalyptic number.

It is an amenable number.

81794372353 is a deficient number, since it is larger than the sum of its proper divisors (3571155).

81794372353 is a wasteful number, since it uses less digits than its factorization.

81794372353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571154.

The product of its digits is 3810240, while the sum is 52.

The spelling of 81794372353 in words is "eighty-one billion, seven hundred ninety-four million, three hundred seventy-two thousand, three hundred fifty-three".