669246049 has 4 divisors (see below), whose sum is σ = 679234864. Its totient is φ = 659257236.

The previous prime is 669246037. The next prime is 669246077. The reversal of 669246049 is 940642966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669246049 - 2¹¹ = 669244001 is a prime.

It is a super-2 number, since 2×669246049² = 895780548204220802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669246749) 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, 4994307 + ... + 4994440.

It is an arithmetic number, because the mean of its divisors is an integer number (169808716).

Almost surely, 2^669246049 is an apocalyptic number.

It is an amenable number.

669246049 is a deficient number, since it is larger than the sum of its proper divisors (9988815).

669246049 is an equidigital number, since it uses as much as digits as its factorization.

669246049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9988814.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 669246049 is about 25869.7902774646. The cubic root of 669246049 is about 874.7056638310.

The spelling of 669246049 in words is "six hundred sixty-nine million, two hundred forty-six thousand, forty-nine".