66144067597 has 4 divisors (see below), whose sum is σ = 67228396636. Its totient is φ = 65059738560.

The previous prime is 66144067579. The next prime is 66144067607. The reversal of 66144067597 is 79576044166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2945124361 + 63198943236 = 54269^2 + 251394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66144067597 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 (66144068597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542164428 + ... + 542164549.

It is an arithmetic number, because the mean of its divisors is an integer number (16807099159).

Almost surely, 2^66144067597 is an apocalyptic number.

It is an amenable number.

66144067597 is a deficient number, since it is larger than the sum of its proper divisors (1084329039).

66144067597 is a wasteful number, since it uses less digits than its factorization.

66144067597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084329038.

The product of its (nonzero) digits is 7620480, while the sum is 55.

The spelling of 66144067597 in words is "sixty-six billion, one hundred forty-four million, sixty-seven thousand, five hundred ninety-seven".