66751810000 has 50 divisors (see below), whose sum is σ = 161612831402. Its totient is φ = 26700720000.

The previous prime is 66751809997. The next prime is 66751810051. The reversal of 66751810000 is 1815766.

It can be written as a sum of positive squares in 5 ways, for example, as 40891310656 + 25860499344 = 202216^2 + 160812^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a super-2 number, since 2×66751810000² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3327591 + ... + 3347590.

Almost surely, 2^66751810000 is an apocalyptic number.

It is an amenable number.

66751810000 is an abundant number, since it is smaller than the sum of its proper divisors (94861021402).

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

66751810000 is an equidigital number, since it uses as much as digits as its factorization.

66751810000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6675209 (or 6675188 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 66751810000 in words is "sixty-six billion, seven hundred fifty-one million, eight hundred ten thousand".