65329651921 has 2 divisors, whose sum is σ = 65329651922. Its totient is φ = 65329651920.

The previous prime is 65329651909. The next prime is 65329651991. The reversal of 65329651921 is 12915692356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62518001296 + 2811650625 = 250036^2 + 53025^2 .

It is a cyclic number.

It is not a de Polignac number, because 65329651921 - 2¹¹ = 65329649873 is a prime.

It is not a weakly prime, because it can be changed into another prime (65329651991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32664825960 + 32664825961.

It is an arithmetic number, because the mean of its divisors is an integer number (32664825961).

Almost surely, 2^65329651921 is an apocalyptic number.

It is an amenable number.

65329651921 is a deficient number, since it is larger than the sum of its proper divisors (1).

65329651921 is an equidigital number, since it uses as much as digits as its factorization.

65329651921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 49.

The spelling of 65329651921 in words is "sixty-five billion, three hundred twenty-nine million, six hundred fifty-one thousand, nine hundred twenty-one".