669740246 has 16 divisors (see below), whose sum is σ = 1148514720. Its totient is φ = 286934400.

The previous prime is 669740237. The next prime is 669740257. The reversal of 669740246 is 642047966.

It is a super-2 number, since 2×669740246² = 897103994224281032, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 669740197 and 669740206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48296 + ... + 60596.

It is an arithmetic number, because the mean of its divisors is an integer number (71782170).

Almost surely, 2^669740246 is an apocalyptic number.

669740246 is a deficient number, since it is larger than the sum of its proper divisors (478774474).

669740246 is a wasteful number, since it uses less digits than its factorization.

669740246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16199.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 669740246 is about 25879.3401384193. The cubic root of 669740246 is about 874.9209162811.

The spelling of 669740246 in words is "six hundred sixty-nine million, seven hundred forty thousand, two hundred forty-six".