18944906887604 has 6 divisors (see below), whose sum is σ = 33153587053314. Its totient is φ = 9472453443800.

The previous prime is 18944906887591. The next prime is 18944906887639. The reversal of 18944906887604 is 40678860944981.

It can be written as a sum of positive squares in only one way, i.e., 15805808825104 + 3139098062500 = 3975652^2 + 1771750^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2368113360947 + ... + 2368113360954.

It is an arithmetic number, because the mean of its divisors is an integer number (5525597842219).

Almost surely, 2^{18944906887604} is an apocalyptic number.

It is an amenable number.

18944906887604 is a deficient number, since it is larger than the sum of its proper divisors (14208680165710).

18944906887604 is a wasteful number, since it uses less digits than its factorization.

18944906887604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4736226721905 (or 4736226721903 counting only the distinct ones).

The product of its (nonzero) digits is 668860416, while the sum is 74.

The spelling of 18944906887604 in words is "eighteen trillion, nine hundred forty-four billion, nine hundred six million, eight hundred eighty-seven thousand, six hundred four".