81100111475 has 12 divisors (see below), whose sum is σ = 102065097624. Its totient is φ = 63911728320.

The previous prime is 81100111457. The next prime is 81100111483. The reversal of 81100111475 is 57411100118.

It is not a de Polignac number, because 81100111475 - 2¹² = 81100107379 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, 24207314 + ... + 24210663.

It is an arithmetic number, because the mean of its divisors is an integer number (8505424802).

Almost surely, 2^81100111475 is an apocalyptic number.

81100111475 is a deficient number, since it is larger than the sum of its proper divisors (20964986149).

81100111475 is a wasteful number, since it uses less digits than its factorization.

81100111475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48418054 (or 48418049 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 29.

The spelling of 81100111475 in words is "eighty-one billion, one hundred million, one hundred eleven thousand, four hundred seventy-five".