646708645790 has 8 divisors (see below), whose sum is σ = 1164075562440. Its totient is φ = 258683458312.

The previous prime is 646708645753. The next prime is 646708645801. The reversal of 646708645790 is 97546807646.

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32335432280 + ... + 32335432299.

It is an arithmetic number, because the mean of its divisors is an integer number (145509445305).

Almost surely, 2^646708645790 is an apocalyptic number.

646708645790 is a deficient number, since it is larger than the sum of its proper divisors (517366916650).

646708645790 is a wasteful number, since it uses less digits than its factorization.

646708645790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64670864586.

The product of its (nonzero) digits is 60963840, while the sum is 62.

The spelling of 646708645790 in words is "six hundred forty-six billion, seven hundred eight million, six hundred forty-five thousand, seven hundred ninety".