646225279 has 6 divisors (see below), whose sum is σ = 751731504. Its totient is φ = 553907340.

The previous prime is 646225259. The next prime is 646225291. The reversal of 646225279 is 972522646.

It is not a de Polignac number, because 646225279 - 2⁵ = 646225247 is a prime.

It is a super-2 number, since 2×646225279² = 835214222437255682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646225259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6594087 + ... + 6594184.

It is an arithmetic number, because the mean of its divisors is an integer number (125288584).

Almost surely, 2^646225279 is an apocalyptic number.

646225279 is a deficient number, since it is larger than the sum of its proper divisors (105506225).

646225279 is a wasteful number, since it uses less digits than its factorization.

646225279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13188285 (or 13188278 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The square root of 646225279 is about 25420.9614098287. The cubic root of 646225279 is about 864.5590227804.

The spelling of 646225279 in words is "six hundred forty-six million, two hundred twenty-five thousand, two hundred seventy-nine".