18401890079 has 4 divisors (see below), whose sum is σ = 18591600384. Its totient is φ = 18212179776.

The previous prime is 18401890063. The next prime is 18401890103. The reversal of 18401890079 is 97009810481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18401890079 - 2⁴ = 18401890063 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 (18401890009) 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, 94855007 + ... + 94855200.

It is an arithmetic number, because the mean of its divisors is an integer number (4647900096).

Almost surely, 2^18401890079 is an apocalyptic number.

18401890079 is a deficient number, since it is larger than the sum of its proper divisors (189710305).

18401890079 is an equidigital number, since it uses as much as digits as its factorization.

18401890079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189710304.

The product of its (nonzero) digits is 145152, while the sum is 47.

The spelling of 18401890079 in words is "eighteen billion, four hundred one million, eight hundred ninety thousand, seventy-nine".