18880840229 has 2 divisors, whose sum is σ = 18880840230. Its totient is φ = 18880840228.

The previous prime is 18880840213. The next prime is 18880840241. The reversal of 18880840229 is 92204808881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15054799204 + 3826041025 = 122698^2 + 61855^2 .

It is a cyclic number.

It is not a de Polignac number, because 18880840229 - 2⁴ = 18880840213 is a prime.

It is a super-2 number, since 2×18880840229² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18880840289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440420114 + 9440420115.

It is an arithmetic number, because the mean of its divisors is an integer number (9440420115).

Almost surely, 2^18880840229 is an apocalyptic number.

It is an amenable number.

18880840229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18880840229 is an equidigital number, since it uses as much as digits as its factorization.

18880840229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 589824, while the sum is 50.

The spelling of 18880840229 in words is "eighteen billion, eight hundred eighty million, eight hundred forty thousand, two hundred twenty-nine".