66201623864 has 64 divisors (see below), whose sum is σ = 131874415200. Its totient is φ = 31102170624.

The previous prime is 66201623783. The next prime is 66201623869. The reversal of 66201623864 is 46832610266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66201623869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2751374 + ... + 2775330.

Almost surely, 2^66201623864 is an apocalyptic number.

It is an amenable number.

66201623864 is a deficient number, since it is larger than the sum of its proper divisors (65672791336).

66201623864 is a wasteful number, since it uses less digits than its factorization.

66201623864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24312 (or 24308 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 66201623864 in words is "sixty-six billion, two hundred one million, six hundred twenty-three thousand, eight hundred sixty-four".