66556500673 has 12 divisors (see below), whose sum is σ = 73233736660. Its totient is φ = 60129578592.

The previous prime is 66556500667. The next prime is 66556500679. The reversal of 66556500673 is 37600565566.

It is an interprime number because it is at equal distance from previous prime (66556500667) and next prime (66556500679).

It can be written as a sum of positive squares in 2 ways, for example, as 9639901489 + 56916599184 = 98183^2 + 238572^2 .

It is not a de Polignac number, because 66556500673 - 2⁹ = 66556500161 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66556500679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1130118 + ... + 1187551.

Almost surely, 2^66556500673 is an apocalyptic number.

It is an amenable number.

66556500673 is a deficient number, since it is larger than the sum of its proper divisors (6677235987).

66556500673 is a wasteful number, since it uses less digits than its factorization.

66556500673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317776 (or 2317729 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 49.

The spelling of 66556500673 in words is "sixty-six billion, five hundred fifty-six million, five hundred thousand, six hundred seventy-three".