64690543 has 2 divisors, whose sum is σ = 64690544. Its totient is φ = 64690542.

The previous prime is 64690531. The next prime is 64690547. The reversal of 64690543 is 34509646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64690543 - 2⁵ = 64690511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64690547) 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, 32345271 + 32345272.

It is an arithmetic number, because the mean of its divisors is an integer number (32345272).

Almost surely, 2^64690543 is an apocalyptic number.

64690543 is a deficient number, since it is larger than the sum of its proper divisors (1).

64690543 is an equidigital number, since it uses as much as digits as its factorization.

64690543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 64690543 is about 8043.0431429901. The cubic root of 64690543 is about 401.4334878944.

The spelling of 64690543 in words is "sixty-four million, six hundred ninety thousand, five hundred forty-three".