66851594632 has 8 divisors (see below), whose sum is σ = 125346739950. Its totient is φ = 33425797312.

The previous prime is 66851594533. The next prime is 66851594647. The reversal of 66851594632 is 23649515866.

It can be written as a sum of positive squares in only one way, i.e., 47303640036 + 19547954596 = 217494^2 + 139814^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4178224657 + ... + 4178224672.

Almost surely, 2^66851594632 is an apocalyptic number.

It is an amenable number.

66851594632 is a deficient number, since it is larger than the sum of its proper divisors (58495145318).

66851594632 is a wasteful number, since it uses less digits than its factorization.

66851594632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8356449335 (or 8356449331 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 55.

The spelling of 66851594632 in words is "sixty-six billion, eight hundred fifty-one million, five hundred ninety-four thousand, six hundred thirty-two".