18840243554 has 16 divisors (see below), whose sum is σ = 32452094880. Its totient is φ = 8113023360.

The previous prime is 18840243509. The next prime is 18840243563. The reversal of 18840243554 is 45534204881.

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, 22535759 + ... + 22536594.

It is an arithmetic number, because the mean of its divisors is an integer number (2028255930).

Almost surely, 2^18840243554 is an apocalyptic number.

18840243554 is a deficient number, since it is larger than the sum of its proper divisors (13611851326).

18840243554 is a wasteful number, since it uses less digits than its factorization.

18840243554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45072385.

The product of its (nonzero) digits is 614400, while the sum is 44.

The spelling of 18840243554 in words is "eighteen billion, eight hundred forty million, two hundred forty-three thousand, five hundred fifty-four".