66418252 has 24 divisors (see below), whose sum is σ = 123560640. Its totient is φ = 31130880.

The previous prime is 66418193. The next prime is 66418267. The reversal of 66418252 is 25281466.

It is a super-2 number, since 2×66418252² = 8822768397471008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 16477 + ... + 20107.

It is an arithmetic number, because the mean of its divisors is an integer number (5148360).

Almost surely, 2^66418252 is an apocalyptic number.

It is an amenable number.

66418252 is a deficient number, since it is larger than the sum of its proper divisors (57142388).

66418252 is a wasteful number, since it uses less digits than its factorization.

66418252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921 (or 3919 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 66418252 is about 8149.7393823361. The cubic root of 66418252 is about 404.9758701267.

The spelling of 66418252 in words is "sixty-six million, four hundred eighteen thousand, two hundred fifty-two".