65999993 has 2 divisors, whose sum is σ = 65999994. Its totient is φ = 65999992.

The previous prime is 65999951. The next prime is 66000007. The reversal of 65999993 is 39999956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64850809 + 1149184 = 8053^2 + 1072^2 .

It is a cyclic number.

It is not a de Polignac number, because 65999993 - 2⁶ = 65999929 is a prime.

It is not a weakly prime, because it can be changed into another prime (65999393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32999996 + 32999997.

It is an arithmetic number, because the mean of its divisors is an integer number (32999997).

Almost surely, 2^65999993 is an apocalyptic number.

It is an amenable number.

65999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

65999993 is an equidigital number, since it uses as much as digits as its factorization.

65999993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5314410, while the sum is 59.

The square root of 65999993 is about 8124.0379738157. The cubic root of 65999993 is about 404.1239877750.

The spelling of 65999993 in words is "sixty-five million, nine hundred ninety-nine thousand, nine hundred ninety-three".