81791111425 has 12 divisors (see below), whose sum is σ = 101627553456. Its totient is φ = 65299614800.

The previous prime is 81791111393. The next prime is 81791111449. The reversal of 81791111425 is 52411119718.

It is not a de Polignac number, because 81791111425 - 2⁵ = 81791111393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3319339 + ... + 3343888.

It is an arithmetic number, because the mean of its divisors is an integer number (8468962788).

Almost surely, 2^81791111425 is an apocalyptic number.

It is an amenable number.

81791111425 is a deficient number, since it is larger than the sum of its proper divisors (19836442031).

81791111425 is a wasteful number, since it uses less digits than its factorization.

81791111425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6663728 (or 6663723 counting only the distinct ones).

The product of its digits is 20160, while the sum is 40.

The spelling of 81791111425 in words is "eighty-one billion, seven hundred ninety-one million, one hundred eleven thousand, four hundred twenty-five".