221666122664734 has 16 divisors (see below), whose sum is σ = 381817244782080. Its totient is φ = 95454311195160.

The previous prime is 221666122664717. The next prime is 221666122664747. The reversal of 221666122664734 is 437466221666122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265150864014 + ... + 265150864849.

It is an arithmetic number, because the mean of its divisors is an integer number (23863577798880).

Almost surely, 2^{221666122664734} is an apocalyptic number.

221666122664734 is a deficient number, since it is larger than the sum of its proper divisors (160151122117346).

221666122664734 is a wasteful number, since it uses less digits than its factorization.

221666122664734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530301728895.

The product of its digits is 41803776, while the sum is 58.

The spelling of 221666122664734 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, one hundred twenty-two million, six hundred sixty-four thousand, seven hundred thirty-four".