65806993 has 4 divisors (see below), whose sum is σ = 75208000. Its totient is φ = 56405988.

The previous prime is 65806967. The next prime is 65806997. The reversal of 65806993 is 39960856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65806993 is a prime.

It is a super-3 number, since 3×65806993³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (65806997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4700493 + ... + 4700506.

It is an arithmetic number, because the mean of its divisors is an integer number (18802000).

Almost surely, 2^65806993 is an apocalyptic number.

It is an amenable number.

65806993 is a deficient number, since it is larger than the sum of its proper divisors (9401007).

65806993 is an equidigital number, since it uses as much as digits as its factorization.

65806993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9401006.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 65806993 is about 8112.1509478066. The cubic root of 65806993 is about 403.7296843002.

The spelling of 65806993 in words is "sixty-five million, eight hundred six thousand, nine hundred ninety-three".