66144677757 has 4 divisors (see below), whose sum is σ = 88192903680. Its totient is φ = 44096451836.

The previous prime is 66144677723. The next prime is 66144677771. The reversal of 66144677757 is 75777644166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66144677757 - 2¹⁰ = 66144676733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66144677757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66144677707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11024112957 + ... + 11024112962.

It is an arithmetic number, because the mean of its divisors is an integer number (22048225920).

Almost surely, 2^66144677757 is an apocalyptic number.

It is an amenable number.

66144677757 is a deficient number, since it is larger than the sum of its proper divisors (22048225923).

66144677757 is a wasteful number, since it uses less digits than its factorization.

66144677757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22048225922.

The product of its digits is 41489280, while the sum is 60.

The spelling of 66144677757 in words is "sixty-six billion, one hundred forty-four million, six hundred seventy-seven thousand, seven hundred fifty-seven".