66518489 has 16 divisors (see below), whose sum is σ = 72230400. Its totient is φ = 61113024.

The previous prime is 66518453. The next prime is 66518497. The reversal of 66518489 is 98481566.

It is a cyclic number.

It is not a de Polignac number, because 66518489 - 2²⁴ = 49741273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66518189) 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, 49772 + ... + 51090.

It is an arithmetic number, because the mean of its divisors is an integer number (4514400).

Almost surely, 2^66518489 is an apocalyptic number.

It is an amenable number.

66518489 is a deficient number, since it is larger than the sum of its proper divisors (5711911).

66518489 is a wasteful number, since it uses less digits than its factorization.

66518489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its digits is 414720, while the sum is 47.

The square root of 66518489 is about 8155.8867696897. The cubic root of 66518489 is about 405.1794946887.

The spelling of 66518489 in words is "sixty-six million, five hundred eighteen thousand, four hundred eighty-nine".