66748635172 has 12 divisors (see below), whose sum is σ = 119659138956. Its totient is φ = 32560309760.

The previous prime is 66748635139. The next prime is 66748635193. The reversal of 66748635172 is 27153684766.

It can be written as a sum of positive squares in 2 ways, for example, as 7711298596 + 59037336576 = 87814^2 + 242976^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203501773 + ... + 203502100.

It is an arithmetic number, because the mean of its divisors is an integer number (9971594913).

Almost surely, 2^66748635172 is an apocalyptic number.

It is an amenable number.

66748635172 is a deficient number, since it is larger than the sum of its proper divisors (52910503784).

66748635172 is a wasteful number, since it uses less digits than its factorization.

66748635172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407003918 (or 407003916 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 55.

The spelling of 66748635172 in words is "sixty-six billion, seven hundred forty-eight million, six hundred thirty-five thousand, one hundred seventy-two".