18005951937 has 4 divisors (see below), whose sum is σ = 24007935920. Its totient is φ = 12003967956.

The previous prime is 18005951927. The next prime is 18005951941. The reversal of 18005951937 is 73915950081.

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 not a de Polignac number, because 18005951937 - 2⁴ = 18005951921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18005951927) 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, 3000991987 + ... + 3000991992.

It is an arithmetic number, because the mean of its divisors is an integer number (6001983980).

Almost surely, 2^18005951937 is an apocalyptic number.

It is an amenable number.

18005951937 is a deficient number, since it is larger than the sum of its proper divisors (6001983983).

18005951937 is an equidigital number, since it uses as much as digits as its factorization.

18005951937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001983982.

The product of its (nonzero) digits is 340200, while the sum is 48.

The spelling of 18005951937 in words is "eighteen billion, five million, nine hundred fifty-one thousand, nine hundred thirty-seven".