18745861829 has 8 divisors (see below), whose sum is σ = 18974655000. Its totient is φ = 18517472512.

The previous prime is 18745861807. The next prime is 18745861837. The reversal of 18745861829 is 92816854781.

It can be written as a sum of positive squares in 4 ways, for example, as 4868550625 + 13877311204 = 69775^2 + 117802^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18745861829 - 2³² = 14450894533 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 (18745869829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7034 + ... + 193755.

It is an arithmetic number, because the mean of its divisors is an integer number (2371831875).

Almost surely, 2^18745861829 is an apocalyptic number.

It is an amenable number.

18745861829 is a deficient number, since it is larger than the sum of its proper divisors (228793171).

18745861829 is a wasteful number, since it uses less digits than its factorization.

18745861829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201927.

The product of its digits is 7741440, while the sum is 59.

The spelling of 18745861829 in words is "eighteen billion, seven hundred forty-five million, eight hundred sixty-one thousand, eight hundred twenty-nine".