65117993 has 4 divisors (see below), whose sum is σ = 65211588. Its totient is φ = 65024400.

The previous prime is 65117977. The next prime is 65118029. The reversal of 65117993 is 39971156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21187609 + 43930384 = 4603^2 + 6628^2 .

It is a cyclic number.

It is not a de Polignac number, because 65117993 - 2⁴ = 65117977 is a prime.

It is a super-3 number, since 3×65117993³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65117993.

It is not an unprimeable number, because it can be changed into a prime (65117593) 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, 45746 + ... + 47147.

It is an arithmetic number, because the mean of its divisors is an integer number (16302897).

Almost surely, 2^65117993 is an apocalyptic number.

It is an amenable number.

65117993 is a deficient number, since it is larger than the sum of its proper divisors (93595).

65117993 is an equidigital number, since it uses as much as digits as its factorization.

65117993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93594.

The product of its digits is 51030, while the sum is 41.

The square root of 65117993 is about 8069.5720456540. The cubic root of 65117993 is about 402.3157198164.

The spelling of 65117993 in words is "sixty-five million, one hundred seventeen thousand, nine hundred ninety-three".