66887788750 has 40 divisors (see below), whose sum is σ = 127740153816. Its totient is φ = 26250276000.

The previous prime is 66887788739. The next prime is 66887788811. The reversal of 66887788750 is 5788778866.

It is a self number, because there is not a number n which added to its sum of digits gives 66887788750.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 438564 + ... + 571063.

Almost surely, 2^66887788750 is an apocalyptic number.

66887788750 is a deficient number, since it is larger than the sum of its proper divisors (60852365066).

66887788750 is a wasteful number, since it uses less digits than its factorization.

66887788750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009702 (or 1009687 counting only the distinct ones).

The product of its (nonzero) digits is 252887040, while the sum is 70.

The spelling of 66887788750 in words is "sixty-six billion, eight hundred eighty-seven million, seven hundred eighty-eight thousand, seven hundred fifty".