66667400680 has 32 divisors (see below), whose sum is σ = 154055753640. Its totient is φ = 25946231040.

The previous prime is 66667400629. The next prime is 66667400689. The reversal of 66667400680 is 8600476666.

It can be written as a sum of positive squares in 4 ways, for example, as 57303741924 + 9363658756 = 239382^2 + 96766^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66667400689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22521291 + ... + 22524250.

Almost surely, 2^66667400680 is an apocalyptic number.

It is an amenable number.

66667400680 is an abundant number, since it is smaller than the sum of its proper divisors (87388352960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66667400680 is a wasteful number, since it uses less digits than its factorization.

66667400680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45045589 (or 45045585 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 66667400680 in words is "sixty-six billion, six hundred sixty-seven million, four hundred thousand, six hundred eighty".