18650660 has 48 divisors (see below), whose sum is σ = 45239040. Its totient is φ = 6326400.

The previous prime is 18650633. The next prime is 18650669. The reversal of 18650660 is 6605681.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18650669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13481 + ... + 14799.

It is an arithmetic number, because the mean of its divisors is an integer number (942480).

Almost surely, 2^18650660 is an apocalyptic number.

18650660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18650660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22619520).

18650660 is an abundant number, since it is smaller than the sum of its proper divisors (26588380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18650660 is a wasteful number, since it uses less digits than its factorization.

18650660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436 (or 1434 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 18650660 is about 4318.6409899412. The cubic root of 18650660 is about 265.1946356976.

The spelling of 18650660 in words is "eighteen million, six hundred fifty thousand, six hundred sixty".