65664706701550 has 48 divisors (see below), whose sum is σ = 133259177898000. Its totient is φ = 23874577228800.

The previous prime is 65664706701509. The next prime is 65664706701557. The reversal of 65664706701550 is 5510760746656.

65664706701550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65664706701557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4985475 + ... + 12497374.

It is an arithmetic number, because the mean of its divisors is an integer number (2776232872875).

Almost surely, 2^{65664706701550} is an apocalyptic number.

65664706701550 is an abundant number, since it is smaller than the sum of its proper divisors (67594471196450).

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

65664706701550 is a wasteful number, since it uses less digits than its factorization.

65664706701550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17489701 (or 17489696 counting only the distinct ones).

The product of its (nonzero) digits is 31752000, while the sum is 58.

The spelling of 65664706701550 in words is "sixty-five trillion, six hundred sixty-four billion, seven hundred six million, seven hundred one thousand, five hundred fifty".