18372444997 has 8 divisors (see below), whose sum is σ = 18604343520. Its totient is φ = 18140797680.

The previous prime is 18372444949. The next prime is 18372445019. The reversal of 18372444997 is 79944427381.

It is a happy number.

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 18372444997 - 2¹⁹ = 18371920709 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 (18372444917) 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, 86622 + ... + 210352.

It is an arithmetic number, because the mean of its divisors is an integer number (2325542940).

Almost surely, 2^18372444997 is an apocalyptic number.

It is an amenable number.

18372444997 is a deficient number, since it is larger than the sum of its proper divisors (231898523).

18372444997 is a wasteful number, since it uses less digits than its factorization.

18372444997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125603.

The product of its digits is 12192768, while the sum is 58.

The spelling of 18372444997 in words is "eighteen billion, three hundred seventy-two million, four hundred forty-four thousand, nine hundred ninety-seven".