66839922 has 54 divisors (see below), whose sum is σ = 151663629. Its totient is φ = 21274080.

The previous prime is 66839917. The next prime is 66839959. The reversal of 66839922 is 22993866.

It can be written as a sum of positive squares in 2 ways, for example, as 47734281 + 19105641 = 6909^2 + 4371^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5781.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1422103 + ... + 1422149.

Almost surely, 2^66839922 is an apocalyptic number.

66839922 is an abundant number, since it is smaller than the sum of its proper divisors (84823707).

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

66839922 is a wasteful number, since it uses less digits than its factorization.

66839922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 93 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 66839922 is about 8175.5686040789. The cubic root of 66839922 is about 405.8310871683.

The spelling of 66839922 in words is "sixty-six million, eight hundred thirty-nine thousand, nine hundred twenty-two".