66723500673 has 12 divisors (see below), whose sum is σ = 96916818960. Its totient is φ = 44233828056.

The previous prime is 66723500671. The next prime is 66723500749. The reversal of 66723500673 is 37600532766.

66723500673 is a `hidden beast` number, since 6 + 6 + 72 + 3 + 500 + 6 + 73 = 666.

It is not a de Polignac number, because 66723500673 - 2¹ = 66723500671 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66723500671) 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, 20707111 + ... + 20710332.

It is an arithmetic number, because the mean of its divisors is an integer number (8076401580).

Almost surely, 2^66723500673 is an apocalyptic number.

It is an amenable number.

66723500673 is a deficient number, since it is larger than the sum of its proper divisors (30193318287).

66723500673 is a wasteful number, since it uses less digits than its factorization.

66723500673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41417628 (or 41417625 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 45.

The spelling of 66723500673 in words is "sixty-six billion, seven hundred twenty-three million, five hundred thousand, six hundred seventy-three".