66641071324624 has 20 divisors (see below), whose sum is σ = 130059536102244. Its totient is φ = 33077320072448.

The previous prime is 66641071324601. The next prime is 66641071324627. The reversal of 66641071324624 is 42642317014666.

It can be written as a sum of positive squares in 2 ways, for example, as 46335521280400 + 20305550044224 = 6807020^2 + 4506168^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66641071324627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15200972107 + ... + 15200976490.

Almost surely, 2^{66641071324624} is an apocalyptic number.

It is an amenable number.

66641071324624 is a deficient number, since it is larger than the sum of its proper divisors (63418464777620).

66641071324624 is a wasteful number, since it uses less digits than its factorization.

66641071324624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30401948742 (or 30401948736 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 52.

The spelling of 66641071324624 in words is "sixty-six trillion, six hundred forty-one billion, seventy-one million, three hundred twenty-four thousand, six hundred twenty-four".