64644303293 has 2 divisors, whose sum is σ = 64644303294. Its totient is φ = 64644303292.

The previous prime is 64644303271. The next prime is 64644303329. The reversal of 64644303293 is 39230344646.

Together with next prime (64644303329) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63039659929 + 1604643364 = 251077^2 + 40058^2 .

It is a cyclic number.

It is not a de Polignac number, because 64644303293 - 2¹⁰ = 64644302269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64644303253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322151646 + 32322151647.

It is an arithmetic number, because the mean of its divisors is an integer number (32322151647).

Almost surely, 2^64644303293 is an apocalyptic number.

It is an amenable number.

64644303293 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644303293 is an equidigital number, since it uses as much as digits as its factorization.

64644303293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 44.

The spelling of 64644303293 in words is "sixty-four billion, six hundred forty-four million, three hundred three thousand, two hundred ninety-three".