65665387 has 4 divisors (see below), whose sum is σ = 69121480. Its totient is φ = 62209296.

The previous prime is 65665381. The next prime is 65665393. The reversal of 65665387 is 78356656.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (65665381) and next prime (65665393).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65665387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65665381) 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, 1728018 + ... + 1728055.

It is an arithmetic number, because the mean of its divisors is an integer number (17280370).

Almost surely, 2^65665387 is an apocalyptic number.

65665387 is a deficient number, since it is larger than the sum of its proper divisors (3456093).

65665387 is a wasteful number, since it uses less digits than its factorization.

65665387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3456092.

The product of its digits is 907200, while the sum is 46.

The square root of 65665387 is about 8103.4182293647. The cubic root of 65665387 is about 403.4398893538.

The spelling of 65665387 in words is "sixty-five million, six hundred sixty-five thousand, three hundred eighty-seven".