65986505999 has 4 divisors (see below), whose sum is σ = 66331985280. Its totient is φ = 65641026720.

The previous prime is 65986505989. The next prime is 65986506023. The reversal of 65986505999 is 99950568956.

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 65986505999 - 2³² = 61691538703 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 (65986505909) 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, 172739354 + ... + 172739735.

It is an arithmetic number, because the mean of its divisors is an integer number (16582996320).

Almost surely, 2^65986505999 is an apocalyptic number.

65986505999 is a deficient number, since it is larger than the sum of its proper divisors (345479281).

65986505999 is a wasteful number, since it uses less digits than its factorization.

65986505999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345479280.

The product of its (nonzero) digits is 236196000, while the sum is 71.

The spelling of 65986505999 in words is "sixty-five billion, nine hundred eighty-six million, five hundred five thousand, nine hundred ninety-nine".