18195694100 has 18 divisors (see below), whose sum is σ = 39484656414. Its totient is φ = 7278277600.

The previous prime is 18195694073. The next prime is 18195694117. The reversal of 18195694100 is 149659181.

It can be written as a sum of positive squares in 3 ways, for example, as 764301316 + 17431392784 = 27646^2 + 132028^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90978371 + ... + 90978570.

It is an arithmetic number, because the mean of its divisors is an integer number (2193592023).

Almost surely, 2^18195694100 is an apocalyptic number.

18195694100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18195694100 is an abundant number, since it is smaller than the sum of its proper divisors (21288962314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18195694100 is a wasteful number, since it uses less digits than its factorization.

18195694100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181956955 (or 181956948 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 18195694100 in words is "eighteen billion, one hundred ninety-five million, six hundred ninety-four thousand, one hundred".