66521700973 has 16 divisors (see below), whose sum is σ = 82288483200. Its totient is φ = 52365370176.

The previous prime is 66521700937. The next prime is 66521700977. The reversal of 66521700973 is 37900712566.

It is not a de Polignac number, because 66521700973 - 2¹⁷ = 66521569901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66521700977) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1837423 + ... + 1873276.

It is an arithmetic number, because the mean of its divisors is an integer number (5143030200).

Almost surely, 2^66521700973 is an apocalyptic number.

It is an amenable number.

66521700973 is a deficient number, since it is larger than the sum of its proper divisors (15766782227).

66521700973 is a wasteful number, since it uses less digits than its factorization.

66521700973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710916.

The product of its (nonzero) digits is 476280, while the sum is 46.

The spelling of 66521700973 in words is "sixty-six billion, five hundred twenty-one million, seven hundred thousand, nine hundred seventy-three".