64644446206460 has 24 divisors (see below), whose sum is σ = 136744237309680. Its totient is φ = 25669035572864.

The previous prime is 64644446206391. The next prime is 64644446206469. The reversal of 64644446206460 is 6460264444646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 64644446206396 and 64644446206405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644446206469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11796429050 + ... + 11796434529.

It is an arithmetic number, because the mean of its divisors is an integer number (5697676554570).

Almost surely, 2^{64644446206460} is an apocalyptic number.

It is an amenable number.

64644446206460 is an abundant number, since it is smaller than the sum of its proper divisors (72099791103220).

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

64644446206460 is a wasteful number, since it uses less digits than its factorization.

64644446206460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23592863725 (or 23592863723 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 56.

The spelling of 64644446206460 in words is "sixty-four trillion, six hundred forty-four billion, four hundred forty-six million, two hundred six thousand, four hundred sixty".