66416375 has 8 divisors (see below), whose sum is σ = 82887792. Its totient is φ = 53133000.

The previous prime is 66416333. The next prime is 66416377. The reversal of 66416375 is 57361466.

It is a happy number.

It is not a de Polignac number, because 66416375 - 2¹² = 66412279 is a prime.

It is a super-2 number, since 2×66416375² = 8822269736281250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66416377) 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, 265541 + ... + 265790.

It is an arithmetic number, because the mean of its divisors is an integer number (10360974).

Almost surely, 2^66416375 is an apocalyptic number.

66416375 is a deficient number, since it is larger than the sum of its proper divisors (16471417).

66416375 is an equidigital number, since it uses as much as digits as its factorization.

66416375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531346 (or 531336 counting only the distinct ones).

The product of its digits is 90720, while the sum is 38.

The square root of 66416375 is about 8149.6242244658. The cubic root of 66416375 is about 404.9720551770.

The spelling of 66416375 in words is "sixty-six million, four hundred sixteen thousand, three hundred seventy-five".