18919773726 has 16 divisors (see below), whose sum is σ = 43245197184. Its totient is φ = 5405649624.

The previous prime is 18919773713. The next prime is 18919773749. The reversal of 18919773726 is 62737791981.

It is a self number, because there is not a number n which added to its sum of digits gives 18919773726.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225235360 + ... + 225235443.

It is an arithmetic number, because the mean of its divisors is an integer number (2702824824).

Almost surely, 2^18919773726 is an apocalyptic number.

18919773726 is an abundant number, since it is smaller than the sum of its proper divisors (24325423458).

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

18919773726 is a wasteful number, since it uses less digits than its factorization.

18919773726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450470815.

The product of its digits is 8001504, while the sum is 60.

The spelling of 18919773726 in words is "eighteen billion, nine hundred nineteen million, seven hundred seventy-three thousand, seven hundred twenty-six".