66195747028 has 12 divisors (see below), whose sum is σ = 118973437492. Its totient is φ = 32203336320.

The previous prime is 66195747017. The next prime is 66195747029. The reversal of 66195747028 is 82074759166.

It can be written as a sum of positive squares in 2 ways, for example, as 45617270724 + 20578476304 = 213582^2 + 143452^2 .

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66195747028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66195747029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223634133 + ... + 223634428.

Almost surely, 2^66195747028 is an apocalyptic number.

It is an amenable number.

66195747028 is a deficient number, since it is larger than the sum of its proper divisors (52777690464).

66195747028 is a wasteful number, since it uses less digits than its factorization.

66195747028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447268602 (or 447268600 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 66195747028 in words is "sixty-six billion, one hundred ninety-five million, seven hundred forty-seven thousand, twenty-eight".