66215240164155 has 32 divisors (see below), whose sum is σ = 106053970800384. Its totient is φ = 35278268144256.

The previous prime is 66215240164079. The next prime is 66215240164163. The reversal of 66215240164155 is 55146104251266.

It is a happy number.

It is not a de Polignac number, because 66215240164155 - 2¹³ = 66215240155963 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 743921884 + ... + 744010886.

It is an arithmetic number, because the mean of its divisors is an integer number (3314186587512).

Almost surely, 2^{66215240164155} is an apocalyptic number.

66215240164155 is a deficient number, since it is larger than the sum of its proper divisors (39838730636229).

66215240164155 is a wasteful number, since it uses less digits than its factorization.

66215240164155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139755.

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 66215240164155 in words is "sixty-six trillion, two hundred fifteen billion, two hundred forty million, one hundred sixty-four thousand, one hundred fifty-five".