64363681 has 2 divisors, whose sum is σ = 64363682. Its totient is φ = 64363680.

The previous prime is 64363667. The next prime is 64363693. The reversal of 64363681 is 18636346.

64363681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60202081 + 4161600 = 7759^2 + 2040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64363681 is a prime.

It is a super-2 number, since 2×64363681² = 8285366863739522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64363681.

It is not a weakly prime, because it can be changed into another prime (64363181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32181840 + 32181841.

It is an arithmetic number, because the mean of its divisors is an integer number (32181841).

Almost surely, 2^64363681 is an apocalyptic number.

It is an amenable number.

64363681 is a deficient number, since it is larger than the sum of its proper divisors (1).

64363681 is an equidigital number, since it uses as much as digits as its factorization.

64363681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 37.

The square root of 64363681 is about 8022.6978629386. The cubic root of 64363681 is about 400.7562381088.

It can be divided in two parts, 6436368 and 1, that added together give a square (6436369 = 2537²).

The spelling of 64363681 in words is "sixty-four million, three hundred sixty-three thousand, six hundred eighty-one".