64223967749 has 2 divisors, whose sum is σ = 64223967750. Its totient is φ = 64223967748.

The previous prime is 64223967721. The next prime is 64223967757. The reversal of 64223967749 is 94776932246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35563170724 + 28660797025 = 188582^2 + 169295^2 .

It is a cyclic number.

It is not a de Polignac number, because 64223967749 - 2²⁴ = 64207190533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64223967349) 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, 32111983874 + 32111983875.

It is an arithmetic number, because the mean of its divisors is an integer number (32111983875).

Almost surely, 2^64223967749 is an apocalyptic number.

It is an amenable number.

64223967749 is a deficient number, since it is larger than the sum of its proper divisors (1).

64223967749 is an equidigital number, since it uses as much as digits as its factorization.

64223967749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 59.

The spelling of 64223967749 in words is "sixty-four billion, two hundred twenty-three million, nine hundred sixty-seven thousand, seven hundred forty-nine".