66731620816329 has 32 divisors (see below), whose sum is σ = 106687243960320. Its totient is φ = 36297323380800.

The previous prime is 66731620816261. The next prime is 66731620816331. The reversal of 66731620816329 is 92361802613766.

It is not a de Polignac number, because 66731620816329 - 2²⁸ = 66731352380873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66731620816349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 840176109 + ... + 840255530.

It is an arithmetic number, because the mean of its divisors is an integer number (3333976373760).

Almost surely, 2^{66731620816329} is an apocalyptic number.

It is an amenable number.

66731620816329 is a deficient number, since it is larger than the sum of its proper divisors (39955623143991).

66731620816329 is a wasteful number, since it uses less digits than its factorization.

66731620816329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680431741.

The product of its (nonzero) digits is 23514624, while the sum is 60.

The spelling of 66731620816329 in words is "sixty-six trillion, seven hundred thirty-one billion, six hundred twenty million, eight hundred sixteen thousand, three hundred twenty-nine".