66316644 has 36 divisors (see below), whose sum is σ = 173844944. Its totient is φ = 22105224.

The previous prime is 66316637. The next prime is 66316651. The reversal of 66316644 is 44661366.

66316644 is a `hidden beast` number, since 6 + 6 + 3 + 1 + 6 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (66316637) and next prime (66316651).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 66316599 and 66316608.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33142 + ... + 35085.

Almost surely, 2^66316644 is an apocalyptic number.

It is an amenable number.

66316644 is an abundant number, since it is smaller than the sum of its proper divisors (107528300).

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

66316644 is a wasteful number, since it uses less digits than its factorization.

66316644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68246 (or 68232 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 66316644 is about 8143.5031773801. The cubic root of 66316644 is about 404.7692512719.

The spelling of 66316644 in words is "sixty-six million, three hundred sixteen thousand, six hundred forty-four".