646662946 has 4 divisors (see below), whose sum is σ = 969994422. Its totient is φ = 323331472.

The previous prime is 646662937. The next prime is 646662977. The reversal of 646662946 is 649266646.

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

It can be written as a sum of positive squares in only one way, i.e., 643383225 + 3279721 = 25365^2 + 1811^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646662946.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161665735 + ... + 161665738.

Almost surely, 2^646662946 is an apocalyptic number.

646662946 is a deficient number, since it is larger than the sum of its proper divisors (323331476).

646662946 is a wasteful number, since it uses less digits than its factorization.

646662946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323331475.

The product of its digits is 2239488, while the sum is 49.

The square root of 646662946 is about 25429.5683408114. The cubic root of 646662946 is about 864.7541578078.

The spelling of 646662946 in words is "six hundred forty-six million, six hundred sixty-two thousand, nine hundred forty-six".