66640153605 has 16 divisors (see below), whose sum is σ = 106637846784. Its totient is φ = 35536881600.

The previous prime is 66640153603. The next prime is 66640153627. The reversal of 66640153605 is 50635104666.

It is not a de Polignac number, because 66640153605 - 2¹ = 66640153603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66640153603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160114 + ... + 398643.

It is an arithmetic number, because the mean of its divisors is an integer number (6664865424).

Almost surely, 2^66640153605 is an apocalyptic number.

It is an amenable number.

66640153605 is a deficient number, since it is larger than the sum of its proper divisors (39997693179).

66640153605 is a wasteful number, since it uses less digits than its factorization.

66640153605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566716.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 66640153605 in words is "sixty-six billion, six hundred forty million, one hundred fifty-three thousand, six hundred five".