66147537645 has 24 divisors (see below), whose sum is σ = 131035122816. Its totient is φ = 30238874208.

The previous prime is 66147537601. The next prime is 66147537649. The reversal of 66147537645 is 54673574166.

66147537645 is a `hidden beast` number, since 6 + 6 + 1 + 47 + 537 + 64 + 5 = 666.

It is not a de Polignac number, because 66147537645 - 2⁹ = 66147537133 is a prime.

It is a super-3 number, since 3×66147537645³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66147537591 and 66147537600.

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 23 ways as a sum of consecutive naturals, for example, 104995777 + ... + 104996406.

It is an arithmetic number, because the mean of its divisors is an integer number (5459796784).

Almost surely, 2^66147537645 is an apocalyptic number.

It is an amenable number.

66147537645 is a deficient number, since it is larger than the sum of its proper divisors (64887585171).

66147537645 is a wasteful number, since it uses less digits than its factorization.

66147537645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209992201 (or 209992198 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 54.

The spelling of 66147537645 in words is "sixty-six billion, one hundred forty-seven million, five hundred thirty-seven thousand, six hundred forty-five".