646866002 has 4 divisors (see below), whose sum is σ = 970299006. Its totient is φ = 323433000.

The previous prime is 646865987. The next prime is 646866023. The reversal of 646866002 is 200668646.

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., 537266041 + 109599961 = 23179^2 + 10469^2 .

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, 161716499 + ... + 161716502.

Almost surely, 2^646866002 is an apocalyptic number.

646866002 is a deficient number, since it is larger than the sum of its proper divisors (323433004).

646866002 is a wasteful number, since it uses less digits than its factorization.

646866002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323433003.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 646866002 is about 25433.5605450751. The cubic root of 646866002 is about 864.8446609803.

The spelling of 646866002 in words is "six hundred forty-six million, eight hundred sixty-six thousand, two".