18221742037 has 4 divisors (see below), whose sum is σ = 18308101216. Its totient is φ = 18135382860.

The previous prime is 18221742001. The next prime is 18221742047. The reversal of 18221742037 is 73024712281.

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: 73024712281 = 4937 ⋅14791313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18221742037 is a prime.

It is a super-3 number, since 3×18221742037³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18221741987 and 18221742005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221742047) 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, 43179273 + ... + 43179694.

It is an arithmetic number, because the mean of its divisors is an integer number (4577025304).

Almost surely, 2^18221742037 is an apocalyptic number.

It is an amenable number.

18221742037 is a deficient number, since it is larger than the sum of its proper divisors (86359179).

18221742037 is an equidigital number, since it uses as much as digits as its factorization.

18221742037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86359178.

The product of its (nonzero) digits is 37632, while the sum is 37.

The spelling of 18221742037 in words is "eighteen billion, two hundred twenty-one million, seven hundred forty-two thousand, thirty-seven".