18365901959 has 8 divisors (see below), whose sum is σ = 18476983440. Its totient is φ = 18254877376.

The previous prime is 18365901943. The next prime is 18365901977. The reversal of 18365901959 is 95910956381.

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 18365901959 - 2⁴ = 18365901943 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 (18365901929) 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, 759152 + ... + 782970.

It is an arithmetic number, because the mean of its divisors is an integer number (2309622930).

Almost surely, 2^18365901959 is an apocalyptic number.

18365901959 is a deficient number, since it is larger than the sum of its proper divisors (111081481).

18365901959 is a wasteful number, since it uses less digits than its factorization.

18365901959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28449.

The product of its (nonzero) digits is 2624400, while the sum is 56.

The spelling of 18365901959 in words is "eighteen billion, three hundred sixty-five million, nine hundred one thousand, nine hundred fifty-nine".