18898538405 has 8 divisors (see below), whose sum is σ = 23050020984. Its totient is φ = 14870980800.

The previous prime is 18898538381. The next prime is 18898538411. The reversal of 18898538405 is 50483589881.

It can be written as a sum of positive squares in 4 ways, for example, as 1919666596 + 16978871809 = 43814^2 + 130303^2 .

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

It is not a de Polignac number, because 18898538405 - 2³⁰ = 17824796581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30980906 + ... + 30981515.

It is an arithmetic number, because the mean of its divisors is an integer number (2881252623).

Almost surely, 2^18898538405 is an apocalyptic number.

It is an amenable number.

18898538405 is a deficient number, since it is larger than the sum of its proper divisors (4151482579).

18898538405 is an equidigital number, since it uses as much as digits as its factorization.

18898538405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61962487.

The product of its (nonzero) digits is 11059200, while the sum is 59.

The spelling of 18898538405 in words is "eighteen billion, eight hundred ninety-eight million, five hundred thirty-eight thousand, four hundred five".