18723122537 has 4 divisors (see below), whose sum is σ = 21397854336. Its totient is φ = 16048390740.

The previous prime is 18723122531. The next prime is 18723122573. The reversal of 18723122537 is 73522132781.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 18723122537 - 2¹² = 18723118441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18723122494 and 18723122503.

It is not an unprimeable number, because it can be changed into a prime (18723122531) 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, 1337365889 + ... + 1337365902.

It is an arithmetic number, because the mean of its divisors is an integer number (5349463584).

Almost surely, 2^18723122537 is an apocalyptic number.

It is an amenable number.

18723122537 is a deficient number, since it is larger than the sum of its proper divisors (2674731799).

18723122537 is an equidigital number, since it uses as much as digits as its factorization.

18723122537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674731798.

The product of its digits is 141120, while the sum is 41.

The spelling of 18723122537 in words is "eighteen billion, seven hundred twenty-three million, one hundred twenty-two thousand, five hundred thirty-seven".