65984749919 has 4 divisors (see below), whose sum is σ = 71983363560. Its totient is φ = 59986136280.

The previous prime is 65984749837. The next prime is 65984749931. The reversal of 65984749919 is 91994748956.

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 65984749919 - 2²⁴ = 65967972703 is a prime.

It is a super-2 number, since 2×65984749919² (a number of 22 digits) 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 (65984749969) 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, 2999306804 + ... + 2999306825.

It is an arithmetic number, because the mean of its divisors is an integer number (17995840890).

Almost surely, 2^65984749919 is an apocalyptic number.

65984749919 is a deficient number, since it is larger than the sum of its proper divisors (5998613641).

65984749919 is a wasteful number, since it uses less digits than its factorization.

65984749919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998613640.

The product of its digits is 176359680, while the sum is 71.

The spelling of 65984749919 in words is "sixty-five billion, nine hundred eighty-four million, seven hundred forty-nine thousand, nine hundred nineteen".