646691321902 has 8 divisors (see below), whose sum is σ = 970716760776. Its totient is φ = 323119068312.

The previous prime is 646691321833. The next prime is 646691321957. The reversal of 646691321902 is 209123196646.

646691321902 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 113292753 + ... + 113298460.

It is an arithmetic number, because the mean of its divisors is an integer number (121339595097).

Almost surely, 2^646691321902 is an apocalyptic number.

646691321902 is a deficient number, since it is larger than the sum of its proper divisors (324025438874).

646691321902 is a wasteful number, since it uses less digits than its factorization.

646691321902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226592642.

The product of its (nonzero) digits is 839808, while the sum is 49.

The spelling of 646691321902 in words is "six hundred forty-six billion, six hundred ninety-one million, three hundred twenty-one thousand, nine hundred two".