666350439 has 4 divisors (see below), whose sum is σ = 888467256. Its totient is φ = 444233624.

The previous prime is 666350431. The next prime is 666350441. The reversal of 666350439 is 934053666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666350439 - 2³ = 666350431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666350439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666350431) 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, 111058404 + ... + 111058409.

It is an arithmetic number, because the mean of its divisors is an integer number (222116814).

Almost surely, 2^666350439 is an apocalyptic number.

666350439 is a deficient number, since it is larger than the sum of its proper divisors (222116817).

666350439 is a wasteful number, since it uses less digits than its factorization.

666350439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222116816.

The product of its (nonzero) digits is 349920, while the sum is 42.

The square root of 666350439 is about 25813.7645259269. The cubic root of 666350439 is about 873.4423177350.

The spelling of 666350439 in words is "six hundred sixty-six million, three hundred fifty thousand, four hundred thirty-nine".