66130677845 has 4 divisors (see below), whose sum is σ = 79356813420. Its totient is φ = 52904542272.

The previous prime is 66130677799. The next prime is 66130677901. The reversal of 66130677845 is 54877603166.

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 12666602116 + 53464075729 = 112546^2 + 231223^2 .

It is a cyclic number.

It is not a de Polignac number, because 66130677845 - 2¹⁶ = 66130612309 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6613067780 + ... + 6613067789.

It is an arithmetic number, because the mean of its divisors is an integer number (19839203355).

Almost surely, 2^66130677845 is an apocalyptic number.

It is an amenable number.

66130677845 is a deficient number, since it is larger than the sum of its proper divisors (13226135575).

66130677845 is a wasteful number, since it uses less digits than its factorization.

66130677845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13226135574.

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 66130677845 in words is "sixty-six billion, one hundred thirty million, six hundred seventy-seven thousand, eight hundred forty-five".