64650080021 has 2 divisors, whose sum is σ = 64650080022. Its totient is φ = 64650080020.

The previous prime is 64650080003. The next prime is 64650080039. The reversal of 64650080021 is 12008005646.

It is a balanced prime because it is at equal distance from previous prime (64650080003) and next prime (64650080039).

It can be written as a sum of positive squares in only one way, i.e., 40035607921 + 24614472100 = 200089^2 + 156890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64650080021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64650080021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64650080321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32325040010 + 32325040011.

It is an arithmetic number, because the mean of its divisors is an integer number (32325040011).

Almost surely, 2^64650080021 is an apocalyptic number.

It is an amenable number.

64650080021 is a deficient number, since it is larger than the sum of its proper divisors (1).

64650080021 is an equidigital number, since it uses as much as digits as its factorization.

64650080021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 64650080021 its reverse (12008005646), we get a palindrome (76658085667).

The spelling of 64650080021 in words is "sixty-four billion, six hundred fifty million, eighty thousand, twenty-one".