18971566294038 has 16 divisors (see below), whose sum is σ = 38968622658480. Its totient is φ = 6152940419616.

The previous prime is 18971566293989. The next prime is 18971566294073. The reversal of 18971566294038 is 83049266517981.

It is a congruent number.

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, 42728752693 + ... + 42728753136.

It is an arithmetic number, because the mean of its divisors is an integer number (2435538916155).

It is a 2-persistent number, because it is pandigital, and so is 2⋅18971566294038 = 37943132588076, but 3⋅18971566294038 = 56914698882114 is not.

Almost surely, 2^{18971566294038} is an apocalyptic number.

18971566294038 is an abundant number, since it is smaller than the sum of its proper divisors (19997056364442).

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

18971566294038 is a wasteful number, since it uses less digits than its factorization.

18971566294038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85457505871.

The product of its (nonzero) digits is 156764160, while the sum is 69.

The spelling of 18971566294038 in words is "eighteen trillion, nine hundred seventy-one billion, five hundred sixty-six million, two hundred ninety-four thousand, thirty-eight".