65985917 has 4 divisors (see below), whose sum is σ = 69458880. Its totient is φ = 62512956.

The previous prime is 65985893. The next prime is 65985929. The reversal of 65985917 is 71958956.

It is a happy number.

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 65985917 - 2¹² = 65981821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65985947) 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, 1736453 + ... + 1736490.

It is an arithmetic number, because the mean of its divisors is an integer number (17364720).

Almost surely, 2^65985917 is an apocalyptic number.

It is an amenable number.

65985917 is a deficient number, since it is larger than the sum of its proper divisors (3472963).

65985917 is a wasteful number, since it uses less digits than its factorization.

65985917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3472962.

The product of its digits is 680400, while the sum is 50.

The square root of 65985917 is about 8123.1716096608. The cubic root of 65985917 is about 404.0952561876.

The spelling of 65985917 in words is "sixty-five million, nine hundred eighty-five thousand, nine hundred seventeen".