217790241966 has 64 divisors (see below), whose sum is σ = 555764601600. Its totient is φ = 62523511200.

The previous prime is 217790241941. The next prime is 217790241967. The reversal of 217790241966 is 669142097712.

217790241966 is a `hidden beast` number, since 217 + 7 + 9 + 0 + 2 + 419 + 6 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217790241967) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9637405 + ... + 9659976.

It is an arithmetic number, because the mean of its divisors is an integer number (8683821900).

Almost surely, 2^217790241966 is an apocalyptic number.

217790241966 is an abundant number, since it is smaller than the sum of its proper divisors (337974359634).

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

217790241966 is a wasteful number, since it uses less digits than its factorization.

217790241966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19297422 (or 19297416 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 217790241966 in words is "two hundred seventeen billion, seven hundred ninety million, two hundred forty-one thousand, nine hundred sixty-six".