65991338 has 12 divisors (see below), whose sum is σ = 115148322. Its totient is φ = 28281960.

The previous prime is 65991319. The next prime is 65991353. The reversal of 65991338 is 83319956.

It can be written as a sum of positive squares in only one way, i.e., 65820769 + 170569 = 8113^2 + 413^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

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 in 5 ways as a sum of consecutive naturals, for example, 336593 + ... + 336788.

Almost surely, 2^65991338 is an apocalyptic number.

65991338 is a deficient number, since it is larger than the sum of its proper divisors (49156984).

65991338 is a wasteful number, since it uses less digits than its factorization.

65991338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673397 (or 673390 counting only the distinct ones).

The product of its digits is 174960, while the sum is 44.

The square root of 65991338 is about 8123.5052778957. The cubic root of 65991338 is about 404.1063218842.

The spelling of 65991338 in words is "sixty-five million, nine hundred ninety-one thousand, three hundred thirty-eight".