66427518 has 32 divisors (see below), whose sum is σ = 137846016. Its totient is φ = 21325248.

The previous prime is 66427499. The next prime is 66427523. The reversal of 66427518 is 81572466.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17071 + ... + 20597.

It is an arithmetic number, because the mean of its divisors is an integer number (4307688).

Almost surely, 2^66427518 is an apocalyptic number.

66427518 is an abundant number, since it is smaller than the sum of its proper divisors (71418498).

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

66427518 is a wasteful number, since it uses less digits than its factorization.

66427518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648.

The product of its digits is 80640, while the sum is 39.

The square root of 66427518 is about 8150.3078469466. The cubic root of 66427518 is about 404.9947019578.

It can be divided in two parts, 664 and 27518, that added together give a palindrome (28182).

The spelling of 66427518 in words is "sixty-six million, four hundred twenty-seven thousand, five hundred eighteen".