65513993 has 2 divisors, whose sum is σ = 65513994. Its totient is φ = 65513992.

The previous prime is 65513977. The next prime is 65514011. The reversal of 65513993 is 39931556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49168144 + 16345849 = 7012^2 + 4043^2 .

It is a cyclic number.

It is not a de Polignac number, because 65513993 - 2⁴ = 65513977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65513993.

It is not a weakly prime, because it can be changed into another prime (65513093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32756996 + 32756997.

It is an arithmetic number, because the mean of its divisors is an integer number (32756997).

Almost surely, 2^65513993 is an apocalyptic number.

It is an amenable number.

65513993 is a deficient number, since it is larger than the sum of its proper divisors (1).

65513993 is an equidigital number, since it uses as much as digits as its factorization.

65513993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109350, while the sum is 41.

The square root of 65513993 is about 8094.0714723803. The cubic root of 65513993 is about 403.1296021989.

The spelling of 65513993 in words is "sixty-five million, five hundred thirteen thousand, nine hundred ninety-three".