65998079 has 4 divisors (see below), whose sum is σ = 75426384. Its totient is φ = 56569776.

The previous prime is 65998073. The next prime is 65998081. The reversal of 65998079 is 97089956.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65998079 is a prime.

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 65998079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65998073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4714142 + ... + 4714155.

It is an arithmetic number, because the mean of its divisors is an integer number (18856596).

Almost surely, 2^65998079 is an apocalyptic number.

65998079 is a deficient number, since it is larger than the sum of its proper divisors (9428305).

65998079 is an equidigital number, since it uses as much as digits as its factorization.

65998079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9428304.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 65998079 is about 8123.9201743986. The cubic root of 65998079 is about 404.1200812049.

The spelling of 65998079 in words is "sixty-five million, nine hundred ninety-eight thousand, seventy-nine".