18619778560356 has 144 divisors (see below), whose sum is σ = 49902748779520. Its totient is φ = 5843495105280.

The previous prime is 18619778560349. The next prime is 18619778560381. The reversal of 18619778560356 is 65306587791681.

18619778560356 is a `hidden beast` number, since 1 + 8 + 6 + 1 + 9 + 7 + 7 + 8 + 5 + 603 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 862455210 + ... + 862476798.

Almost surely, 2^{18619778560356} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18619778560356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24951374389760).

18619778560356 is an abundant number, since it is smaller than the sum of its proper divisors (31282970219164).

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

18619778560356 is a wasteful number, since it uses less digits than its factorization.

18619778560356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42554 (or 42549 counting only the distinct ones).

The product of its (nonzero) digits is 457228800, while the sum is 72.

The spelling of 18619778560356 in words is "eighteen trillion, six hundred nineteen billion, seven hundred seventy-eight million, five hundred sixty thousand, three hundred fifty-six".