646553630 has 8 divisors (see below), whose sum is σ = 1163796552. Its totient is φ = 258621448.

The previous prime is 646553629. The next prime is 646553659. The reversal of 646553630 is 36355646.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32327672 + ... + 32327691.

It is an arithmetic number, because the mean of its divisors is an integer number (145474569).

Almost surely, 2^646553630 is an apocalyptic number.

646553630 is a deficient number, since it is larger than the sum of its proper divisors (517242922).

646553630 is a wasteful number, since it uses less digits than its factorization.

646553630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64655370.

The product of its (nonzero) digits is 194400, while the sum is 38.

The square root of 646553630 is about 25427.4188623226. The cubic root of 646553630 is about 864.7054272219.

The spelling of 646553630 in words is "six hundred forty-six million, five hundred fifty-three thousand, six hundred thirty".