18617890749 has 8 divisors (see below), whose sum is σ = 24839025120. Its totient is φ = 12404341776.

The previous prime is 18617890741. The next prime is 18617890793. The reversal of 18617890749 is 94709871681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18617890749 - 2³ = 18617890741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18617890692 and 18617890701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18617890741) 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, 1890619 + ... + 1900440.

It is an arithmetic number, because the mean of its divisors is an integer number (3104878140).

Almost surely, 2^18617890749 is an apocalyptic number.

It is an amenable number.

18617890749 is a deficient number, since it is larger than the sum of its proper divisors (6221134371).

18617890749 is a wasteful number, since it uses less digits than its factorization.

18617890749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792699.

The product of its (nonzero) digits is 6096384, while the sum is 60.

The spelling of 18617890749 in words is "eighteen billion, six hundred seventeen million, eight hundred ninety thousand, seven hundred forty-nine".