65999738 has 16 divisors (see below), whose sum is σ = 114694080. Its totient is φ = 27897696.

The previous prime is 65999723. The next prime is 65999753. The reversal of 65999738 is 83799956.

It is an interprime number because it is at equal distance from previous prime (65999723) and next prime (65999753).

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 7 ways as a sum of consecutive naturals, for example, 31268 + ... + 33311.

It is an arithmetic number, because the mean of its divisors is an integer number (7168380).

Almost surely, 2^65999738 is an apocalyptic number.

65999738 is a deficient number, since it is larger than the sum of its proper divisors (48694342).

65999738 is a wasteful number, since it uses less digits than its factorization.

65999738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64661.

The product of its digits is 3674160, while the sum is 56.

The square root of 65999738 is about 8124.0222796346. The cubic root of 65999738 is about 404.1234673116.

The spelling of 65999738 in words is "sixty-five million, nine hundred ninety-nine thousand, seven hundred thirty-eight".