64400066652 has 24 divisors (see below), whose sum is σ = 150318773136. Its totient is φ = 21459267328.

The previous prime is 64400066603. The next prime is 64400066671. The reversal of 64400066652 is 25666000446.

It is a self number, because there is not a number n which added to its sum of digits gives 64400066652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891483 + ... + 961010.

It is an arithmetic number, because the mean of its divisors is an integer number (6263282214).

Almost surely, 2^64400066652 is an apocalyptic number.

It is an amenable number.

64400066652 is an abundant number, since it is smaller than the sum of its proper divisors (85918706484).

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

64400066652 is a wasteful number, since it uses less digits than its factorization.

64400066652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855397 (or 1855395 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 64400066652 in words is "sixty-four billion, four hundred million, sixty-six thousand, six hundred fifty-two".