66128433 has 8 divisors (see below), whose sum is σ = 100767168. Its totient is φ = 37787664.

The previous prime is 66128411. The next prime is 66128441. The reversal of 66128433 is 33482166.

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

It is not a de Polignac number, because 66128433 - 2¹⁰ = 66127409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66128394 and 66128403.

It is not an unprimeable number, because it can be changed into a prime (66128443) 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, 1574466 + ... + 1574507.

It is an arithmetic number, because the mean of its divisors is an integer number (12595896).

Almost surely, 2^66128433 is an apocalyptic number.

It is an amenable number.

66128433 is a deficient number, since it is larger than the sum of its proper divisors (34638735).

66128433 is a wasteful number, since it uses less digits than its factorization.

66128433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148983.

The product of its digits is 20736, while the sum is 33.

The square root of 66128433 is about 8131.9390676517. The cubic root of 66128433 is about 404.3859678574.

The spelling of 66128433 in words is "sixty-six million, one hundred twenty-eight thousand, four hundred thirty-three".