64644440626458 has 48 divisors (see below), whose sum is σ = 174623943514176. Its totient is φ = 16790763798720.

The previous prime is 64644440626457. The next prime is 64644440626459. The reversal of 64644440626458 is 85462604444646.

64644440626458 is a `hidden beast` number, since 6 + 46 + 4 + 44 + 40 + 62 + 6 + 458 = 666.

It is an interprime number because it is at equal distance from previous prime (64644440626457) and next prime (64644440626459).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 64644440626395 and 64644440626404.

It is not an unprimeable number, because it can be changed into a prime (64644440626457) 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, 23320503891 + ... + 23320506662.

It is an arithmetic number, because the mean of its divisors is an integer number (3637998823212).

Almost surely, 2^{64644440626458} is an apocalyptic number.

64644440626458 is an abundant number, since it is smaller than the sum of its proper divisors (109979502887718).

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

64644440626458 is a wasteful number, since it uses less digits than its factorization.

64644440626458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46641010579 (or 46641010576 counting only the distinct ones).

The product of its (nonzero) digits is 424673280, while the sum is 63.

The spelling of 64644440626458 in words is "sixty-four trillion, six hundred forty-four billion, four hundred forty million, six hundred twenty-six thousand, four hundred fifty-eight".