18553608781450 has 96 divisors (see below), whose sum is σ = 37505358253440. Its totient is φ = 6800970700800.

The previous prime is 18553608781447. The next prime is 18553608781451. The reversal of 18553608781450 is 5418780635581.

It is a happy number.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18553608781451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17000341 + ... + 18058759.

It is an arithmetic number, because the mean of its divisors is an integer number (390680815140).

Almost surely, 2^{18553608781450} is an apocalyptic number.

18553608781450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18553608781450 is an abundant number, since it is smaller than the sum of its proper divisors (18951749471990).

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

18553608781450 is a wasteful number, since it uses less digits than its factorization.

18553608781450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058992 (or 1058987 counting only the distinct ones).

The product of its (nonzero) digits is 32256000, while the sum is 61.

The spelling of 18553608781450 in words is "eighteen trillion, five hundred fifty-three billion, six hundred eight million, seven hundred eighty-one thousand, four hundred fifty".