66693810423 has 16 divisors (see below), whose sum is σ = 96452457696. Its totient is φ = 40826434560.

The previous prime is 66693810377. The next prime is 66693810427. The reversal of 66693810423 is 32401839666.

It is not a de Polignac number, because 66693810423 - 2⁸ = 66693810167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66693810427) 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, 15945736 + ... + 15949917.

It is an arithmetic number, because the mean of its divisors is an integer number (6028278606).

Almost surely, 2^66693810423 is an apocalyptic number.

66693810423 is a deficient number, since it is larger than the sum of its proper divisors (29758647273).

66693810423 is a wasteful number, since it uses less digits than its factorization.

66693810423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31895714.

The product of its (nonzero) digits is 1119744, while the sum is 48.

The spelling of 66693810423 in words is "sixty-six billion, six hundred ninety-three million, eight hundred ten thousand, four hundred twenty-three".