66215262506540 has 24 divisors (see below), whose sum is σ = 158916630016032. Its totient is φ = 22702375716480.

The previous prime is 66215262506483. The next prime is 66215262506611. The reversal of 66215262506540 is 4560526251266.

66215262506540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 236483080241 + ... + 236483080520.

It is an arithmetic number, because the mean of its divisors is an integer number (6621526250668).

Almost surely, 2^{66215262506540} is an apocalyptic number.

It is an amenable number.

66215262506540 is an abundant number, since it is smaller than the sum of its proper divisors (92701367509492).

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

66215262506540 is a wasteful number, since it uses less digits than its factorization.

66215262506540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472966160777 (or 472966160775 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 66215262506540 in words is "sixty-six trillion, two hundred fifteen billion, two hundred sixty-two million, five hundred six thousand, five hundred forty".