64646422224220 has 48 divisors (see below), whose sum is σ = 135837757440000. Its totient is φ = 25843282632000.

The previous prime is 64646422224211. The next prime is 64646422224247. The reversal of 64646422224220 is 2242222464646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316793781 + ... + 316997779.

It is an arithmetic number, because the mean of its divisors is an integer number (2829953280000).

Almost surely, 2^{64646422224220} is an apocalyptic number.

It is an amenable number.

64646422224220 is an abundant number, since it is smaller than the sum of its proper divisors (71191335215780).

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

64646422224220 is a wasteful number, since it uses less digits than its factorization.

64646422224220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213298 (or 213296 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 46.

Adding to 64646422224220 its reverse (2242222464646), we get a palindrome (66888644688866).

The spelling of 64646422224220 in words is "sixty-four trillion, six hundred forty-six billion, four hundred twenty-two million, two hundred twenty-four thousand, two hundred twenty".