66723543 has 12 divisors (see below), whose sum is σ = 98983768. Its totient is φ = 43279920.

The previous prime is 66723539. The next prime is 66723583. The reversal of 66723543 is 34532766.

It is not a de Polignac number, because 66723543 - 2² = 66723539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66723498 and 66723507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66723583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99853 + ... + 100518.

Almost surely, 2^66723543 is an apocalyptic number.

66723543 is a deficient number, since it is larger than the sum of its proper divisors (32260225).

66723543 is a wasteful number, since it uses less digits than its factorization.

66723543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200414 (or 200411 counting only the distinct ones).

The product of its digits is 90720, while the sum is 36.

The square root of 66723543 is about 8168.4480166063. The cubic root of 66723543 is about 405.5954113774.

The spelling of 66723543 in words is "sixty-six million, seven hundred twenty-three thousand, five hundred forty-three".