66636538560 has 672 divisors, whose sum is σ = 251615569920. Its totient is φ = 16124313600.

The previous prime is 66636538489. The next prime is 66636538583. The reversal of 66636538560 is 6583563666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66636538497 and 66636538506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 276500040 + ... + 276500280.

Almost surely, 2^66636538560 is an apocalyptic number.

66636538560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66636538560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125807784960).

66636538560 is an abundant number, since it is smaller than the sum of its proper divisors (184979031360).

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

66636538560 is a wasteful number, since it uses less digits than its factorization.

66636538560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 54.

The spelling of 66636538560 in words is "sixty-six billion, six hundred thirty-six million, five hundred thirty-eight thousand, five hundred sixty".