81793891354 has 8 divisors (see below), whose sum is σ = 140218099488. Its totient is φ = 35054524860.

The previous prime is 81793891349. The next prime is 81793891391. The reversal of 81793891354 is 45319839718.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2921210392 + ... + 2921210419.

It is an arithmetic number, because the mean of its divisors is an integer number (17527262436).

Almost surely, 2^81793891354 is an apocalyptic number.

81793891354 is a deficient number, since it is larger than the sum of its proper divisors (58424208134).

81793891354 is a wasteful number, since it uses less digits than its factorization.

81793891354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5842420820.

The product of its digits is 6531840, while the sum is 58.

The spelling of 81793891354 in words is "eighty-one billion, seven hundred ninety-three million, eight hundred ninety-one thousand, three hundred fifty-four".