66147537646 has 32 divisors (see below), whose sum is σ = 104869261440. Its totient is φ = 31241150976.

The previous prime is 66147537601. The next prime is 66147537649. The reversal of 66147537646 is 64673574166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66147537649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12637846 + ... + 12643078.

It is an arithmetic number, because the mean of its divisors is an integer number (3277164420).

Almost surely, 2^66147537646 is an apocalyptic number.

66147537646 is a deficient number, since it is larger than the sum of its proper divisors (38721723794).

66147537646 is a wasteful number, since it uses less digits than its factorization.

66147537646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9948.

The product of its digits is 15240960, while the sum is 55.

The spelling of 66147537646 in words is "sixty-six billion, one hundred forty-seven million, five hundred thirty-seven thousand, six hundred forty-six".