18745169551 has 2 divisors, whose sum is σ = 18745169552. Its totient is φ = 18745169550.

The previous prime is 18745169503. The next prime is 18745169581. The reversal of 18745169551 is 15596154781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18745169551 - 2¹³ = 18745161359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18745169581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372584775 + 9372584776.

It is an arithmetic number, because the mean of its divisors is an integer number (9372584776).

Almost surely, 2^18745169551 is an apocalyptic number.

18745169551 is a deficient number, since it is larger than the sum of its proper divisors (1).

18745169551 is an equidigital number, since it uses as much as digits as its factorization.

18745169551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512000, while the sum is 52.

The spelling of 18745169551 in words is "eighteen billion, seven hundred forty-five million, one hundred sixty-nine thousand, five hundred fifty-one".