65183706721 has 9 divisors (see below), whose sum is σ = 75828023571. Its totient is φ = 55870216752.

The previous prime is 65183706673. The next prime is 65183706743. The reversal of 65183706721 is 12760738156.

The square root of 65183706721 is 255311.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 25238088225 + 39945618496 = 158865^2 + 199864^2 .

It is not a de Polignac number, because 65183706721 - 2²⁹ = 64646835809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65183706221) 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 8 ways as a sum of consecutive naturals, for example, 1768941 + ... + 1805413.

Almost surely, 2^65183706721 is an apocalyptic number.

65183706721 is the 255311-st square number.

65183706721 is the 127656-th centered octagonal number.

It is an amenable number.

65183706721 is a deficient number, since it is larger than the sum of its proper divisors (10644316850).

65183706721 is an frugal number, since it uses more digits than its factorization.

65183706721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72960 (or 36480 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 65183706721 in words is "sixty-five billion, one hundred eighty-three million, seven hundred six thousand, seven hundred twenty-one".