18355514159551 has 2 divisors, whose sum is σ = 18355514159552. Its totient is φ = 18355514159550.

The previous prime is 18355514159531. The next prime is 18355514159611. The reversal of 18355514159551 is 15595141555381.

It is a weak prime.

It is an emirp because it is prime and its reverse (15595141555381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18355514159551 is a prime.

It is a super-2 number, since 2×18355514159551² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18355514159531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9177757079775 + 9177757079776.

It is an arithmetic number, because the mean of its divisors is an integer number (9177757079776).

Almost surely, 2^{18355514159551} is an apocalyptic number.

18355514159551 is a deficient number, since it is larger than the sum of its proper divisors (1).

18355514159551 is an equidigital number, since it uses as much as digits as its factorization.

18355514159551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13500000, while the sum is 58.

The spelling of 18355514159551 in words is "eighteen trillion, three hundred fifty-five billion, five hundred fourteen million, one hundred fifty-nine thousand, five hundred fifty-one".