18956039338 has 16 divisors (see below), whose sum is σ = 28542927816. Its totient is φ = 9441768960.

The previous prime is 18956039279. The next prime is 18956039353. The reversal of 18956039338 is 83393065981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1661948289 + 17294091049 = 40767^2 + 131507^2 .

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, 1081170 + ... + 1098562.

Almost surely, 2^18956039338 is an apocalyptic number.

18956039338 is a deficient number, since it is larger than the sum of its proper divisors (9586888478).

18956039338 is a wasteful number, since it uses less digits than its factorization.

18956039338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19449.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 18956039338 in words is "eighteen billion, nine hundred fifty-six million, thirty-nine thousand, three hundred thirty-eight".