66144460753651 has 16 divisors (see below), whose sum is σ = 76843645818880. Its totient is φ = 55758029525280.

The previous prime is 66144460753643. The next prime is 66144460753697. The reversal of 66144460753651 is 15635706444166.

It is a happy number.

66144460753651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66144460753651 - 2³ = 66144460753643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66144460753621) 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, 7762011 + ... + 13875796.

It is an arithmetic number, because the mean of its divisors is an integer number (4802727863680).

Almost surely, 2^{66144460753651} is an apocalyptic number.

66144460753651 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66144460753651 is a deficient number, since it is larger than the sum of its proper divisors (10699185065229).

66144460753651 is a wasteful number, since it uses less digits than its factorization.

66144460753651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21645034.

The product of its (nonzero) digits is 43545600, while the sum is 58.

The spelling of 66144460753651 in words is "sixty-six trillion, one hundred forty-four billion, four hundred sixty million, seven hundred fifty-three thousand, six hundred fifty-one".