18994924401 has 4 divisors (see below), whose sum is σ = 25326565872. Its totient is φ = 12663282932.

The previous prime is 18994924393. The next prime is 18994924439. The reversal of 18994924401 is 10442949981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10442949981 = 3 ⋅3480983327.

It is a cyclic number.

It is not a de Polignac number, because 18994924401 - 2³ = 18994924393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18994924301) 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, 3165820731 + ... + 3165820736.

It is an arithmetic number, because the mean of its divisors is an integer number (6331641468).

Almost surely, 2^18994924401 is an apocalyptic number.

It is an amenable number.

18994924401 is a deficient number, since it is larger than the sum of its proper divisors (6331641471).

18994924401 is an equidigital number, since it uses as much as digits as its factorization.

18994924401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6331641470.

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 18994924401 in words is "eighteen billion, nine hundred ninety-four million, nine hundred twenty-four thousand, four hundred one".