19401594156 has 144 divisors (see below), whose sum is σ = 60373168128. Its totient is φ = 5131209600.

The previous prime is 19401594083. The next prime is 19401594167. The reversal of 19401594156 is 65149510491.

19401594156 is a `hidden beast` number, since 1 + 9 + 4 + 0 + 1 + 594 + 1 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125686 + ... + 233666.

It is an arithmetic number, because the mean of its divisors is an integer number (419258112).

Almost surely, 2^19401594156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19401594156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30186584064).

19401594156 is an abundant number, since it is smaller than the sum of its proper divisors (40971573972).

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

19401594156 is a wasteful number, since it uses less digits than its factorization.

19401594156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108052 (or 108047 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 19401594156 in words is "nineteen billion, four hundred one million, five hundred ninety-four thousand, one hundred fifty-six".