221640314076647 has 4 divisors (see below), whose sum is σ = 222967501586256. Its totient is φ = 220313126567040.

The previous prime is 221640314076641. The next prime is 221640314076677. The reversal of 221640314076647 is 746670413046122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221640314076647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221640314076641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 663593754554 + ... + 663593754887.

It is an arithmetic number, because the mean of its divisors is an integer number (55741875396564).

Almost surely, 2^{221640314076647} is an apocalyptic number.

221640314076647 is a deficient number, since it is larger than the sum of its proper divisors (1327187509609).

221640314076647 is a wasteful number, since it uses less digits than its factorization.

221640314076647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327187509608.

The product of its (nonzero) digits is 8128512, while the sum is 53.

The spelling of 221640314076647 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred fourteen million, seventy-six thousand, six hundred forty-seven".