66969844 has 6 divisors (see below), whose sum is σ = 117197234. Its totient is φ = 33484920.

The previous prime is 66969823. The next prime is 66969863. The reversal of 66969844 is 44896966.

It can be written as a sum of positive squares in only one way, i.e., 60528400 + 6441444 = 7780^2 + 2538^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66969791 and 66969800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8371227 + ... + 8371234.

Almost surely, 2^66969844 is an apocalyptic number.

It is an amenable number.

66969844 is a deficient number, since it is larger than the sum of its proper divisors (50227390).

66969844 is a wasteful number, since it uses less digits than its factorization.

66969844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16742465 (or 16742463 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 52.

The square root of 66969844 is about 8183.5104936696. The cubic root of 66969844 is about 406.0938655546.

The spelling of 66969844 in words is "sixty-six million, nine hundred sixty-nine thousand, eight hundred forty-four".