65855989 has 4 divisors (see below), whose sum is σ = 66106656. Its totient is φ = 65605324.

The previous prime is 65855987. The next prime is 65856017. The reversal of 65855989 is 98955856.

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 not a de Polignac number, because 65855989 - 2¹ = 65855987 is a prime.

It is a super-2 number, since 2×65855989² = 8674022574336242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65855983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124939 + ... + 125464.

It is an arithmetic number, because the mean of its divisors is an integer number (16526664).

Almost surely, 2^65855989 is an apocalyptic number.

It is an amenable number.

65855989 is a deficient number, since it is larger than the sum of its proper divisors (250667).

65855989 is a wasteful number, since it uses less digits than its factorization.

65855989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250666.

The product of its digits is 3888000, while the sum is 55.

The square root of 65855989 is about 8115.1703001231. The cubic root of 65855989 is about 403.8298572020.

The spelling of 65855989 in words is "sixty-five million, eight hundred fifty-five thousand, nine hundred eighty-nine".