64566266749 has 2 divisors, whose sum is σ = 64566266750. Its totient is φ = 64566266748.

The previous prime is 64566266669. The next prime is 64566266761. The reversal of 64566266749 is 94766266546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58972722649 + 5593544100 = 242843^2 + 74790^2 .

It is a cyclic number.

It is not a de Polignac number, because 64566266749 - 2²¹ = 64564169597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64566266249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32283133374 + 32283133375.

It is an arithmetic number, because the mean of its divisors is an integer number (32283133375).

Almost surely, 2^64566266749 is an apocalyptic number.

It is an amenable number.

64566266749 is a deficient number, since it is larger than the sum of its proper divisors (1).

64566266749 is an equidigital number, since it uses as much as digits as its factorization.

64566266749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 61.

The spelling of 64566266749 in words is "sixty-four billion, five hundred sixty-six million, two hundred sixty-six thousand, seven hundred forty-nine".