666506433 has 8 divisors (see below), whose sum is σ = 889424928. Its totient is φ = 443962784.

The previous prime is 666506413. The next prime is 666506441. The reversal of 666506433 is 334605666.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666506433 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666506391 and 666506400.

It is not an unprimeable number, because it can be changed into a prime (666506413) 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, 89535 + ... + 96692.

It is an arithmetic number, because the mean of its divisors is an integer number (111178116).

Almost surely, 2^666506433 is an apocalyptic number.

It is an amenable number.

666506433 is a deficient number, since it is larger than the sum of its proper divisors (222918495).

666506433 is a wasteful number, since it uses less digits than its factorization.

666506433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187423.

The product of its (nonzero) digits is 233280, while the sum is 39.

The square root of 666506433 is about 25816.7858766346. The cubic root of 666506433 is about 873.5104706278.

The spelling of 666506433 in words is "six hundred sixty-six million, five hundred six thousand, four hundred thirty-three".