18738324551 has 2 divisors, whose sum is σ = 18738324552. Its totient is φ = 18738324550.

The previous prime is 18738324523. The next prime is 18738324559. The reversal of 18738324551 is 15542383781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18738324551 - 2⁶ = 18738324487 is a prime.

It is a super-2 number, since 2×18738324551² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18738324496 and 18738324505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18738324559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369162275 + 9369162276.

It is an arithmetic number, because the mean of its divisors is an integer number (9369162276).

Almost surely, 2^18738324551 is an apocalyptic number.

18738324551 is a deficient number, since it is larger than the sum of its proper divisors (1).

18738324551 is an equidigital number, since it uses as much as digits as its factorization.

18738324551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 47.

The spelling of 18738324551 in words is "eighteen billion, seven hundred thirty-eight million, three hundred twenty-four thousand, five hundred fifty-one".