66938066380 has 12 divisors (see below), whose sum is σ = 140569939440. Its totient is φ = 26775226544.

The previous prime is 66938066369. The next prime is 66938066387. The reversal of 66938066380 is 8366083966.

It is not an unprimeable number, because it can be changed into a prime (66938066387) 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, 1673451640 + ... + 1673451679.

It is an arithmetic number, because the mean of its divisors is an integer number (11714161620).

Almost surely, 2^66938066380 is an apocalyptic number.

It is an amenable number.

66938066380 is an abundant number, since it is smaller than the sum of its proper divisors (73631873060).

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

66938066380 is a wasteful number, since it uses less digits than its factorization.

66938066380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346903328 (or 3346903326 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 55.

The spelling of 66938066380 in words is "sixty-six billion, nine hundred thirty-eight million, sixty-six thousand, three hundred eighty".