19018638308 has 6 divisors (see below), whose sum is σ = 33282617046. Its totient is φ = 9509319152.

The previous prime is 19018638299. The next prime is 19018638311. The reversal of 19018638308 is 80383681091.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11846580964 + 7172057344 = 108842^2 + 84688^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2377329785 + ... + 2377329792.

It is an arithmetic number, because the mean of its divisors is an integer number (5547102841).

Almost surely, 2^19018638308 is an apocalyptic number.

It is an amenable number.

19018638308 is a deficient number, since it is larger than the sum of its proper divisors (14263978738).

19018638308 is a wasteful number, since it uses less digits than its factorization.

19018638308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4754659581 (or 4754659579 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 19018638308 in words is "nineteen billion, eighteen million, six hundred thirty-eight thousand, three hundred eight".