18765438004 has 24 divisors (see below), whose sum is σ = 33472572840. Its totient is φ = 9201988224.

The previous prime is 18765437987. The next prime is 18765438023. The reversal of 18765438004 is 40083456781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4310185104 + 14455252900 = 65652^2 + 120230^2 .

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, 554482 + ... + 587350.

It is an arithmetic number, because the mean of its divisors is an integer number (1394690535).

Almost surely, 2^18765438004 is an apocalyptic number.

It is an amenable number.

18765438004 is a deficient number, since it is larger than the sum of its proper divisors (14707134836).

18765438004 is a wasteful number, since it uses less digits than its factorization.

18765438004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35619 (or 35617 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 18765438004 in words is "eighteen billion, seven hundred sixty-five million, four hundred thirty-eight thousand, four".