64643433434646 has 48 divisors (see below), whose sum is σ = 145949480774832. Its totient is φ = 19059488965440.

The previous prime is 64643433434641. The next prime is 64643433434647.

64643433434646 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 64643433434646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64643433434641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1203223705 + ... + 1203277428.

It is an arithmetic number, because the mean of its divisors is an integer number (3040614182809).

Almost surely, 2^{64643433434646} is an apocalyptic number.

64643433434646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64643433434646 is an abundant number, since it is smaller than the sum of its proper divisors (81306047340186).

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

64643433434646 is a wasteful number, since it uses less digits than its factorization.

64643433434646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406501197 (or 2406501186 counting only the distinct ones).

The product of its digits is 429981696, while the sum is 60.

It can be divided in two parts, 6464343 and 3434646, that added together give a palindrome (9898989).

The spelling of 64643433434646 in words is "sixty-four trillion, six hundred forty-three billion, four hundred thirty-three million, four hundred thirty-four thousand, six hundred forty-six".