66731178373 has 4 divisors (see below), whose sum is σ = 66732444000. Its totient is φ = 66729912748.

The previous prime is 66731178347. The next prime is 66731178391. The reversal of 66731178373 is 37387113766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66731178373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66731178373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66731178673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550123 + ... + 660376.

It is an arithmetic number, because the mean of its divisors is an integer number (16683111000).

Almost surely, 2^66731178373 is an apocalyptic number.

It is an amenable number.

66731178373 is a deficient number, since it is larger than the sum of its proper divisors (1265627).

66731178373 is a wasteful number, since it uses less digits than its factorization.

66731178373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265626.

The product of its digits is 2667168, while the sum is 52.

The spelling of 66731178373 in words is "sixty-six billion, seven hundred thirty-one million, one hundred seventy-eight thousand, three hundred seventy-three".