18019856402 has 16 divisors (see below), whose sum is σ = 28215413592. Its totient is φ = 8622702720.

The previous prime is 18019856381. The next prime is 18019856419. The reversal of 18019856402 is 20465891081.

It can be written as a sum of positive squares in 4 ways, for example, as 12267999121 + 5751857281 = 110761^2 + 75841^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1991483 + ... + 2000510.

Almost surely, 2^18019856402 is an apocalyptic number.

18019856402 is a deficient number, since it is larger than the sum of its proper divisors (10195557190).

18019856402 is a wasteful number, since it uses less digits than its factorization.

18019856402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992093.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 18019856402 in words is "eighteen billion, nineteen million, eight hundred fifty-six thousand, four hundred two".