18033938551 has 2 divisors, whose sum is σ = 18033938552. Its totient is φ = 18033938550.

The previous prime is 18033938513. The next prime is 18033938563. The reversal of 18033938551 is 15583933081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18033938551 - 2²⁹ = 17497067639 is a prime.

It is a super-2 number, since 2×18033938551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18033938581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9016969275 + 9016969276.

It is an arithmetic number, because the mean of its divisors is an integer number (9016969276).

Almost surely, 2^18033938551 is an apocalyptic number.

18033938551 is a deficient number, since it is larger than the sum of its proper divisors (1).

18033938551 is an equidigital number, since it uses as much as digits as its factorization.

18033938551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 18033938551 in words is "eighteen billion, thirty-three million, nine hundred thirty-eight thousand, five hundred fifty-one".