18499397551 has 2 divisors, whose sum is σ = 18499397552. Its totient is φ = 18499397550.

The previous prime is 18499397509. The next prime is 18499397629. The reversal of 18499397551 is 15579399481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18499397551 - 2²⁷ = 18365179823 is a prime.

It is a super-3 number, since 3×18499397551³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18499397551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18499377551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9249698775 + 9249698776.

It is an arithmetic number, because the mean of its divisors is an integer number (9249698776).

Almost surely, 2^18499397551 is an apocalyptic number.

18499397551 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499397551 is an equidigital number, since it uses as much as digits as its factorization.

18499397551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12247200, while the sum is 61.

The spelling of 18499397551 in words is "eighteen billion, four hundred ninety-nine million, three hundred ninety-seven thousand, five hundred fifty-one".