18538958029 has 4 divisors (see below), whose sum is σ = 18545694876. Its totient is φ = 18532221184.

The previous prime is 18538958023. The next prime is 18538958041. The reversal of 18538958029 is 92085983581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92085983581 = 3319 ⋅27745099.

It can be written as a sum of positive squares in 2 ways, for example, as 13688532004 + 4850426025 = 116998^2 + 69645^2 .

It is a cyclic number.

It is not a de Polignac number, because 18538958029 - 2³ = 18538958021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538958021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3364294 + ... + 3369799.

It is an arithmetic number, because the mean of its divisors is an integer number (4636423719).

Almost surely, 2^18538958029 is an apocalyptic number.

It is an amenable number.

18538958029 is a deficient number, since it is larger than the sum of its proper divisors (6736847).

18538958029 is an equidigital number, since it uses as much as digits as its factorization.

18538958029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6736846.

The product of its (nonzero) digits is 6220800, while the sum is 58.

The spelling of 18538958029 in words is "eighteen billion, five hundred thirty-eight million, nine hundred fifty-eight thousand, twenty-nine".