66042212565 has 32 divisors (see below), whose sum is σ = 122809743360. Its totient is φ = 29679015744.

The previous prime is 66042212563. The next prime is 66042212591. The reversal of 66042212565 is 56521224066.

It is not a de Polignac number, because 66042212565 - 2¹ = 66042212563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66042212563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5324089 + ... + 5336478.

It is an arithmetic number, because the mean of its divisors is an integer number (3837804480).

Almost surely, 2^66042212565 is an apocalyptic number.

It is an amenable number.

66042212565 is a deficient number, since it is larger than the sum of its proper divisors (56767530795).

66042212565 is a wasteful number, since it uses less digits than its factorization.

66042212565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10660641.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 66042212565 in words is "sixty-six billion, forty-two million, two hundred twelve thousand, five hundred sixty-five".