646127859960 has 320 divisors, whose sum is σ = 2372463514080. Its totient is φ = 156417039360.

The previous prime is 646127859959. The next prime is 646127859967. The reversal of 646127859960 is 69958721646.

646127859960 is a `hidden beast` number, since 6 + 4 + 612 + 7 + 8 + 5 + 9 + 9 + 6 + 0 = 666.

It is a super-2 number, since 2×646127859960² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646127859967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 26111754 + ... + 26136486.

Almost surely, 2^646127859960 is an apocalyptic number.

646127859960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646127859960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1186231757040).

646127859960 is an abundant number, since it is smaller than the sum of its proper divisors (1726335654120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646127859960 is a wasteful number, since it uses less digits than its factorization.

646127859960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25500 (or 25487 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 646127859960 in words is "six hundred forty-six billion, one hundred twenty-seven million, eight hundred fifty-nine thousand, nine hundred sixty".