64636543 has 2 divisors, whose sum is σ = 64636544. Its totient is φ = 64636542.

The previous prime is 64636493. The next prime is 64636547. The reversal of 64636543 is 34563646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64636543 - 2⁹ = 64636031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64636547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32318271 + 32318272.

It is an arithmetic number, because the mean of its divisors is an integer number (32318272).

Almost surely, 2^64636543 is an apocalyptic number.

64636543 is a deficient number, since it is larger than the sum of its proper divisors (1).

64636543 is an equidigital number, since it uses as much as digits as its factorization.

64636543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 37.

The square root of 64636543 is about 8039.6855037993. The cubic root of 64636543 is about 401.3217588233.

The spelling of 64636543 in words is "sixty-four million, six hundred thirty-six thousand, five hundred forty-three".