18553608781451 has 2 divisors, whose sum is σ = 18553608781452. Its totient is φ = 18553608781450.

The previous prime is 18553608781447. The next prime is 18553608781457. The reversal of 18553608781451 is 15418780635581.

It is a weak prime.

It is an emirp because it is prime and its reverse (15418780635581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18553608781451 - 2² = 18553608781447 is a prime.

It is a super-2 number, since 2×18553608781451² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18553608781457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9276804390725 + 9276804390726.

It is an arithmetic number, because the mean of its divisors is an integer number (9276804390726).

Almost surely, 2^{18553608781451} is an apocalyptic number.

18553608781451 is a deficient number, since it is larger than the sum of its proper divisors (1).

18553608781451 is an equidigital number, since it uses as much as digits as its factorization.

18553608781451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256000, while the sum is 62.

The spelling of 18553608781451 in words is "eighteen trillion, five hundred fifty-three billion, six hundred eight million, seven hundred eighty-one thousand, four hundred fifty-one".