64221303397 has 2 divisors, whose sum is σ = 64221303398. Its totient is φ = 64221303396.

The previous prime is 64221303371. The next prime is 64221303403. The reversal of 64221303397 is 79330312246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42965412961 + 21255890436 = 207281^2 + 145794^2 .

It is a cyclic number.

It is not a de Polignac number, because 64221303397 - 2¹⁹ = 64220779109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64221303347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32110651698 + 32110651699.

It is an arithmetic number, because the mean of its divisors is an integer number (32110651699).

Almost surely, 2^64221303397 is an apocalyptic number.

It is an amenable number.

64221303397 is a deficient number, since it is larger than the sum of its proper divisors (1).

64221303397 is an equidigital number, since it uses as much as digits as its factorization.

64221303397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 40.

The spelling of 64221303397 in words is "sixty-four billion, two hundred twenty-one million, three hundred three thousand, three hundred ninety-seven".