18837665427 has 16 divisors (see below), whose sum is σ = 28708217600. Its totient is φ = 10763178912.

The previous prime is 18837665423. The next prime is 18837665453. The reversal of 18837665427 is 72456673881.

It is not a de Polignac number, because 18837665427 - 2² = 18837665423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18837665423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163848 + ... + 254010.

It is an arithmetic number, because the mean of its divisors is an integer number (1794263600).

Almost surely, 2^18837665427 is an apocalyptic number.

18837665427 is a deficient number, since it is larger than the sum of its proper divisors (9870552173).

18837665427 is an equidigital number, since it uses as much as digits as its factorization.

18837665427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100122.

The product of its digits is 13547520, while the sum is 57.

The spelling of 18837665427 in words is "eighteen billion, eight hundred thirty-seven million, six hundred sixty-five thousand, four hundred twenty-seven".