66561150373 has 16 divisors (see below), whose sum is σ = 68904267264. Its totient is φ = 64230569280.

The previous prime is 66561150323. The next prime is 66561150427. The reversal of 66561150373 is 37305116566.

It is a cyclic number.

It is not a de Polignac number, because 66561150373 - 2⁹ = 66561149861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66561150323) 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 15 ways as a sum of consecutive naturals, for example, 22508211 + ... + 22511167.

It is an arithmetic number, because the mean of its divisors is an integer number (4306516704).

Almost surely, 2^66561150373 is an apocalyptic number.

It is an amenable number.

66561150373 is a deficient number, since it is larger than the sum of its proper divisors (2343116891).

66561150373 is a wasteful number, since it uses less digits than its factorization.

66561150373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4812.

The product of its (nonzero) digits is 340200, while the sum is 43.

The spelling of 66561150373 in words is "sixty-six billion, five hundred sixty-one million, one hundred fifty thousand, three hundred seventy-three".