65930840309 has 4 divisors (see below), whose sum is σ = 66001205004. Its totient is φ = 65860475616.

The previous prime is 65930840243. The next prime is 65930840323. The reversal of 65930840309 is 90304803956.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30547349284 + 35383491025 = 174778^2 + 188105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65930840309 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 (65930860309) 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, 35180942 + ... + 35182815.

It is an arithmetic number, because the mean of its divisors is an integer number (16500301251).

Almost surely, 2^65930840309 is an apocalyptic number.

It is an amenable number.

65930840309 is a deficient number, since it is larger than the sum of its proper divisors (70364695).

65930840309 is an equidigital number, since it uses as much as digits as its factorization.

65930840309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70364694.

The product of its (nonzero) digits is 699840, while the sum is 47.

The spelling of 65930840309 in words is "sixty-five billion, nine hundred thirty million, eight hundred forty thousand, three hundred nine".