64743580261 has 2 divisors, whose sum is σ = 64743580262. Its totient is φ = 64743580260.

The previous prime is 64743580211. The next prime is 64743580303. The reversal of 64743580261 is 16208534746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42022540036 + 22721040225 = 204994^2 + 150735^2 .

It is a cyclic number.

It is not a de Polignac number, because 64743580261 - 2²⁷ = 64609362533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64743580211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32371790130 + 32371790131.

It is an arithmetic number, because the mean of its divisors is an integer number (32371790131).

Almost surely, 2^64743580261 is an apocalyptic number.

It is an amenable number.

64743580261 is a deficient number, since it is larger than the sum of its proper divisors (1).

64743580261 is an equidigital number, since it uses as much as digits as its factorization.

64743580261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 64743580261 in words is "sixty-four billion, seven hundred forty-three million, five hundred eighty thousand, two hundred sixty-one".