19018064836 has 27 divisors (see below), whose sum is σ = 33947510023. Its totient is φ = 9322445600.

The previous prime is 19018064797. The next prime is 19018064873. The reversal of 19018064836 is 63846081091.

The square root of 19018064836 is 137906.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4652604100 + 14365460736 = 68210^2 + 119856^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14617386 + ... + 14618686.

Almost surely, 2^19018064836 is an apocalyptic number.

19018064836 is the 137906-th square number.

It is an amenable number.

19018064836 is a deficient number, since it is larger than the sum of its proper divisors (14929445187).

19018064836 is an frugal number, since it uses more digits than its factorization.

19018064836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 19018064836 in words is "nineteen billion, eighteen million, sixty-four thousand, eight hundred thirty-six".