65997739 has 4 divisors (see below), whose sum is σ = 66025120. Its totient is φ = 65970360.

The previous prime is 65997731. The next prime is 65997749. The reversal of 65997739 is 93779956.

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

It is a cyclic number.

It is not a de Polignac number, because 65997739 - 2³ = 65997731 is a prime.

It is a super-2 number, since 2×65997739² = 8711403106224242, which contains 22 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 65997739.

It is not an unprimeable number, because it can be changed into a prime (65997731) 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, 9684 + ... + 15025.

It is an arithmetic number, because the mean of its divisors is an integer number (16506280).

Almost surely, 2^65997739 is an apocalyptic number.

65997739 is a deficient number, since it is larger than the sum of its proper divisors (27381).

65997739 is a wasteful number, since it uses less digits than its factorization.

65997739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27380.

The product of its digits is 3214890, while the sum is 55.

The square root of 65997739 is about 8123.8992485136. The cubic root of 65997739 is about 404.1193872400.

The spelling of 65997739 in words is "sixty-five million, nine hundred ninety-seven thousand, seven hundred thirty-nine".