81793891353 has 8 divisors (see below), whose sum is σ = 109064023488. Its totient is φ = 54526510064.

The previous prime is 81793891349. The next prime is 81793891391. The reversal of 81793891353 is 35319839718.

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 81793891353 - 2² = 81793891349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81793891293 and 81793891302.

It is not an unprimeable number, because it can be changed into a prime (81793891303) 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, 617301 + ... + 738002.

It is an arithmetic number, because the mean of its divisors is an integer number (13633002936).

Almost surely, 2^81793891353 is an apocalyptic number.

It is an amenable number.

81793891353 is a deficient number, since it is larger than the sum of its proper divisors (27270132135).

81793891353 is a wasteful number, since it uses less digits than its factorization.

81793891353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375423.

The product of its digits is 4898880, while the sum is 57.

The spelling of 81793891353 in words is "eighty-one billion, seven hundred ninety-three million, eight hundred ninety-one thousand, three hundred fifty-three".