66643135 has 8 divisors (see below), whose sum is σ = 86123520. Its totient is φ = 49213344.

The previous prime is 66643117. The next prime is 66643139. The reversal of 66643135 is 53134666.

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 66643135 - 2⁵ = 66643103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66643135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66643139) 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, 512575 + ... + 512704.

It is an arithmetic number, because the mean of its divisors is an integer number (10765440).

Almost surely, 2^66643135 is an apocalyptic number.

66643135 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66643135 is a deficient number, since it is larger than the sum of its proper divisors (19480385).

66643135 is a wasteful number, since it uses less digits than its factorization.

66643135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025297.

The product of its digits is 38880, while the sum is 34.

The square root of 66643135 is about 8163.5246676910. The cubic root of 66643135 is about 405.4324193072.

The spelling of 66643135 in words is "sixty-six million, six hundred forty-three thousand, one hundred thirty-five".