66243543 has 16 divisors (see below), whose sum is σ = 93689856. Its totient is φ = 41489280.

The previous prime is 66243533. The next prime is 66243547. The reversal of 66243543 is 34534266.

It is not a de Polignac number, because 66243543 - 2⁹ = 66243031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66243547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44298 + ... + 45768.

It is an arithmetic number, because the mean of its divisors is an integer number (5855616).

Almost surely, 2^66243543 is an apocalyptic number.

66243543 is a deficient number, since it is larger than the sum of its proper divisors (27446313).

66243543 is a wasteful number, since it uses less digits than its factorization.

66243543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374.

The product of its digits is 51840, while the sum is 33.

The square root of 66243543 is about 8139.0136380276. The cubic root of 66243543 is about 404.6204705439.

The spelling of 66243543 in words is "sixty-six million, two hundred forty-three thousand, five hundred forty-three".