646842137752 has 16 divisors (see below), whose sum is σ = 1213124090400. Its totient is φ = 323342380320.

The previous prime is 646842137657. The next prime is 646842137831. The reversal of 646842137752 is 257731248646.

It is a super-2 number, since 2×646842137752² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646842137693 and 646842137702.

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, 9801127 + ... + 9866902.

It is an arithmetic number, because the mean of its divisors is an integer number (75820255650).

Almost surely, 2^646842137752 is an apocalyptic number.

It is an amenable number.

646842137752 is a deficient number, since it is larger than the sum of its proper divisors (566281952648).

646842137752 is a wasteful number, since it uses less digits than its factorization.

646842137752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19672146 (or 19672142 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 55.

The spelling of 646842137752 in words is "six hundred forty-six billion, eight hundred forty-two million, one hundred thirty-seven thousand, seven hundred fifty-two".