646202121634 has 16 divisors (see below), whose sum is σ = 982617465600. Its totient is φ = 318663292320.

The previous prime is 646202121629. The next prime is 646202121679. The reversal of 646202121634 is 436121202646.

It is a junction number, because it is equal to n+sod(n) for n = 646202121593 and 646202121602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4968567 + ... + 5096965.

It is an arithmetic number, because the mean of its divisors is an integer number (61413591600).

Almost surely, 2^646202121634 is an apocalyptic number.

646202121634 is a deficient number, since it is larger than the sum of its proper divisors (336415343966).

646202121634 is a wasteful number, since it uses less digits than its factorization.

646202121634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162945.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 646202121634 in words is "six hundred forty-six billion, two hundred two million, one hundred twenty-one thousand, six hundred thirty-four".