66930173748 has 48 divisors (see below), whose sum is σ = 183729893760. Its totient is φ = 20997700992.

The previous prime is 66930173707. The next prime is 66930173749. The reversal of 66930173748 is 84737103966.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 66930173694 and 66930173703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66930173749) 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, 18225336 + ... + 18229007.

It is an arithmetic number, because the mean of its divisors is an integer number (3827706120).

Almost surely, 2^66930173748 is an apocalyptic number.

66930173748 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66930173748 is an abundant number, since it is smaller than the sum of its proper divisors (116799720012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66930173748 is a wasteful number, since it uses less digits than its factorization.

66930173748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36454373 (or 36454365 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 66930173748 in words is "sixty-six billion, nine hundred thirty million, one hundred seventy-three thousand, seven hundred forty-eight".