66735143 has 4 divisors (see below), whose sum is σ = 66763800. Its totient is φ = 66706488.

The previous prime is 66735139. The next prime is 66735169. The reversal of 66735143 is 34153766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34153766 = 2 ⋅17076883.

It is a cyclic number.

It is not a de Polignac number, because 66735143 - 2² = 66735139 is a prime.

It is a super-2 number, since 2×66735143² = 8907158622460898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66735103) 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, 10493 + ... + 15606.

It is an arithmetic number, because the mean of its divisors is an integer number (16690950).

Almost surely, 2^66735143 is an apocalyptic number.

66735143 is a deficient number, since it is larger than the sum of its proper divisors (28657).

66735143 is a wasteful number, since it uses less digits than its factorization.

66735143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28656.

The product of its digits is 45360, while the sum is 35.

The square root of 66735143 is about 8169.1580349507. The cubic root of 66735143 is about 405.6189144966.

The spelling of 66735143 in words is "sixty-six million, seven hundred thirty-five thousand, one hundred forty-three".