66772451861850 has 384 divisors, whose sum is σ = 198347716362240. Its totient is φ = 14534682624000.

The previous prime is 66772451861743. The next prime is 66772451861971. The reversal of 66772451861850 is 5816815427766.

66772451861850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9982423306 + ... + 9982429994.

It is an arithmetic number, because the mean of its divisors is an integer number (516530511360).

Almost surely, 2^{66772451861850} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66772451861850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99173858181120).

66772451861850 is an abundant number, since it is smaller than the sum of its proper divisors (131575264500390).

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

66772451861850 is a wasteful number, since it uses less digits than its factorization.

66772451861850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8486 (or 8481 counting only the distinct ones).

The product of its (nonzero) digits is 135475200, while the sum is 66.

The spelling of 66772451861850 in words is "sixty-six trillion, seven hundred seventy-two billion, four hundred fifty-one million, eight hundred sixty-one thousand, eight hundred fifty".