66501620050016 has 24 divisors (see below), whose sum is σ = 132502474894104. Its totient is φ = 32850197854720.

The previous prime is 66501620049973. The next prime is 66501620050043. The reversal of 66501620050016 is 61005002610566.

66501620050016 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 an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12519127625 + ... + 12519132936.

It is an arithmetic number, because the mean of its divisors is an integer number (5520936453921).

Almost surely, 2^{66501620050016} is an apocalyptic number.

It is an amenable number.

66501620050016 is a deficient number, since it is larger than the sum of its proper divisors (66000854844088).

66501620050016 is a wasteful number, since it uses less digits than its factorization.

66501620050016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25038260654 (or 25038260646 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 66501620050016 in words is "sixty-six trillion, five hundred one billion, six hundred twenty million, fifty thousand, sixteen".