66416331 has 8 divisors (see below), whose sum is σ = 93764304. Its totient is φ = 41672960.

The previous prime is 66416309. The next prime is 66416333. The reversal of 66416331 is 13361466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66416331 is a prime.

It is a super-2 number, since 2×66416331² = 8822258047003122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66416333) 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, 651090 + ... + 651191.

It is an arithmetic number, because the mean of its divisors is an integer number (11720538).

Almost surely, 2^66416331 is an apocalyptic number.

66416331 is a deficient number, since it is larger than the sum of its proper divisors (27347973).

66416331 is a wasteful number, since it uses less digits than its factorization.

66416331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302301.

The product of its digits is 7776, while the sum is 30.

The square root of 66416331 is about 8149.6215249544. The cubic root of 66416331 is about 404.9719657474.

Adding to 66416331 its reverse (13361466), we get a palindrome (79777797).

The spelling of 66416331 in words is "sixty-six million, four hundred sixteen thousand, three hundred thirty-one".