66717644012250 has 128 divisors (see below), whose sum is σ = 207618376642560. Its totient is φ = 13863406536000.

The previous prime is 66717644012207. The next prime is 66717644012359. The reversal of 66717644012250 is 5221044671766.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66717644012193 and 66717644012202.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 577584190 + ... + 577699689.

It is an arithmetic number, because the mean of its divisors is an integer number (1622018567520).

Almost surely, 2^{66717644012250} is an apocalyptic number.

66717644012250 is an abundant number, since it is smaller than the sum of its proper divisors (140900732630310).

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

66717644012250 is a wasteful number, since it uses less digits than its factorization.

66717644012250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155283917 (or 1155283907 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 66717644012250 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-four million, twelve thousand, two hundred fifty".