666950429 has 4 divisors (see below), whose sum is σ = 670635420. Its totient is φ = 663265440.

The previous prime is 666950413. The next prime is 666950489. The reversal of 666950429 is 924059666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 924059666 = 2 ⋅462029833.

It can be written as a sum of positive squares in 2 ways, for example, as 181629529 + 485320900 = 13477^2 + 22030^2 .

It is a cyclic number.

It is not a de Polignac number, because 666950429 - 2⁴ = 666950413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666950489) 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, 1842224 + ... + 1842585.

It is an arithmetic number, because the mean of its divisors is an integer number (167658855).

Almost surely, 2^666950429 is an apocalyptic number.

It is an amenable number.

666950429 is a deficient number, since it is larger than the sum of its proper divisors (3684991).

666950429 is a wasteful number, since it uses less digits than its factorization.

666950429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684990.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 666950429 is about 25825.3834240656. The cubic root of 666950429 is about 873.7043917706.

The spelling of 666950429 in words is "six hundred sixty-six million, nine hundred fifty thousand, four hundred twenty-nine".