66912547750 has 64 divisors (see below), whose sum is σ = 127244317824. Its totient is φ = 26342400000.

The previous prime is 66912547747. The next prime is 66912547759. The reversal of 66912547750 is 5774521966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66912547759) 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, 11374810 + ... + 11380690.

It is an arithmetic number, because the mean of its divisors is an integer number (1988192466).

Almost surely, 2^66912547750 is an apocalyptic number.

66912547750 is a deficient number, since it is larger than the sum of its proper divisors (60331770074).

66912547750 is a wasteful number, since it uses less digits than its factorization.

66912547750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6610 (or 6600 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 66912547750 in words is "sixty-six billion, nine hundred twelve million, five hundred forty-seven thousand, seven hundred fifty".