66505743630 has 64 divisors (see below), whose sum is σ = 177857064000. Its totient is φ = 17684023680.

The previous prime is 66505743617. The next prime is 66505743637. The reversal of 66505743630 is 3634750566.

66505743630 is a `hidden beast` number, since 6 + 6 + 5 + 0 + 5 + 7 + 4 + 3 + 630 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505743637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258661 + ... + 447120.

It is an arithmetic number, because the mean of its divisors is an integer number (2779016625).

Almost surely, 2^66505743630 is an apocalyptic number.

66505743630 is an abundant number, since it is smaller than the sum of its proper divisors (111351320370).

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

66505743630 is a wasteful number, since it uses less digits than its factorization.

66505743630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706146 (or 706140 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 45.

The spelling of 66505743630 in words is "sixty-six billion, five hundred five million, seven hundred forty-three thousand, six hundred thirty".