66737543 has 2 divisors, whose sum is σ = 66737544. Its totient is φ = 66737542.

The previous prime is 66737527. The next prime is 66737581. The reversal of 66737543 is 34573766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66737543 - 2⁴ = 66737527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66737543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66727543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368771 + 33368772.

It is an arithmetic number, because the mean of its divisors is an integer number (33368772).

Almost surely, 2^66737543 is an apocalyptic number.

66737543 is a deficient number, since it is larger than the sum of its proper divisors (1).

66737543 is an equidigital number, since it uses as much as digits as its factorization.

66737543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 41.

The square root of 66737543 is about 8169.3049275933. The cubic root of 66737543 is about 405.6237768709.

The spelling of 66737543 in words is "sixty-six million, seven hundred thirty-seven thousand, five hundred forty-three".