18021623783904 has 96 divisors (see below), whose sum is σ = 56606382433440. Its totient is φ = 5545115006976.

The previous prime is 18021623783893. The next prime is 18021623783957. The reversal of 18021623783904 is 40938732612081.

It is a happy number.

18021623783904 is a `hidden beast` number, since 1 + 8 + 0 + 2 + 1 + 623 + 7 + 8 + 3 + 9 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 802233417 + ... + 802255880.

It is an arithmetic number, because the mean of its divisors is an integer number (589649817015).

Almost surely, 2^{18021623783904} is an apocalyptic number.

It is an amenable number.

18021623783904 is an abundant number, since it is smaller than the sum of its proper divisors (38584758649536).

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

18021623783904 is a wasteful number, since it uses less digits than its factorization.

18021623783904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604489329 (or 1604489315 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 18021623783904 in words is "eighteen trillion, twenty-one billion, six hundred twenty-three million, seven hundred eighty-three thousand, nine hundred four".