217825256066 has 8 divisors (see below), whose sum is σ = 356441328144. Its totient is φ = 99011480020.

The previous prime is 217825256039. The next prime is 217825256093. The reversal of 217825256066 is 660652528712.

It is an interprime number because it is at equal distance from previous prime (217825256039) and next prime (217825256093).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4950573980 + ... + 4950574023.

It is an arithmetic number, because the mean of its divisors is an integer number (44555166018).

Almost surely, 2^217825256066 is an apocalyptic number.

217825256066 is a deficient number, since it is larger than the sum of its proper divisors (138616072078).

217825256066 is a wasteful number, since it uses less digits than its factorization.

217825256066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901148016.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 217825256066 in words is "two hundred seventeen billion, eight hundred twenty-five million, two hundred fifty-six thousand, sixty-six".