18650239645 has 8 divisors (see below), whose sum is σ = 22461084504. Its totient is φ = 14866327104.

The previous prime is 18650239639. The next prime is 18650239661. The reversal of 18650239645 is 54693205681.

It can be written as a sum of positive squares in 4 ways, for example, as 1215149881 + 17435089764 = 34859^2 + 132042^2 .

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 18650239645 - 2³³ = 10060305053 is a prime.

It is a super-3 number, since 3×18650239645³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6731554 + ... + 6734323.

It is an arithmetic number, because the mean of its divisors is an integer number (2807635563).

Almost surely, 2^18650239645 is an apocalyptic number.

It is an amenable number.

18650239645 is a deficient number, since it is larger than the sum of its proper divisors (3810844859).

18650239645 is a wasteful number, since it uses less digits than its factorization.

18650239645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13466159.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 18650239645 in words is "eighteen billion, six hundred fifty million, two hundred thirty-nine thousand, six hundred forty-five".