66543373 has 8 divisors (see below), whose sum is σ = 71733816. Its totient is φ = 61363200.

The previous prime is 66543349. The next prime is 66543397. The reversal of 66543373 is 37334566.

It is an interprime number because it is at equal distance from previous prime (66543349) and next prime (66543397).

It can be written as a sum of positive squares in 4 ways, for example, as 6724 + 66536649 = 82^2 + 8157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66543373 - 2¹⁷ = 66412301 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 (66543173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15813 + ... + 19573.

It is an arithmetic number, because the mean of its divisors is an integer number (8966727).

Almost surely, 2^66543373 is an apocalyptic number.

It is an amenable number.

66543373 is a deficient number, since it is larger than the sum of its proper divisors (5190443).

66543373 is a wasteful number, since it uses less digits than its factorization.

66543373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135.

The product of its digits is 136080, while the sum is 37.

The square root of 66543373 is about 8157.4121509214. The cubic root of 66543373 is about 405.2300131220.

The spelling of 66543373 in words is "sixty-six million, five hundred forty-three thousand, three hundred seventy-three".