646836685660 has 96 divisors (see below), whose sum is σ = 1526350662144. Its totient is φ = 228221280000.

The previous prime is 646836685643. The next prime is 646836685667. The reversal of 646836685660 is 66586638646.

646836685660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×646836685660² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646836685592 and 646836685601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646836685667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1202050 + ... + 1654870.

It is an arithmetic number, because the mean of its divisors is an integer number (15899486064).

Almost surely, 2^646836685660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646836685660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763175331072).

646836685660 is an abundant number, since it is smaller than the sum of its proper divisors (879513976484).

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

646836685660 is a wasteful number, since it uses less digits than its factorization.

646836685660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453035 (or 453033 counting only the distinct ones).

The product of its (nonzero) digits is 179159040, while the sum is 64.

The spelling of 646836685660 in words is "six hundred forty-six billion, eight hundred thirty-six million, six hundred eighty-five thousand, six hundred sixty".