64512033021543 has 4 divisors (see below), whose sum is σ = 86016044028728. Its totient is φ = 43008022014360.

The previous prime is 64512033021521. The next prime is 64512033021563. The reversal of 64512033021543 is 34512033021546.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64512033021543 - 2²¹ = 64512030924391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64512033021503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10752005503588 + ... + 10752005503593.

It is an arithmetic number, because the mean of its divisors is an integer number (21504011007182).

Almost surely, 2^{64512033021543} is an apocalyptic number.

64512033021543 is a deficient number, since it is larger than the sum of its proper divisors (21504011007185).

64512033021543 is a wasteful number, since it uses less digits than its factorization.

64512033021543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21504011007184.

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 64512033021543 in words is "sixty-four trillion, five hundred twelve billion, thirty-three million, twenty-one thousand, five hundred forty-three".