221655635642716 has 24 divisors (see below), whose sum is σ = 433481753078640. Its totient is φ = 98295182102400.

The previous prime is 221655635642677. The next prime is 221655635642803. The reversal of 221655635642716 is 617246536556122.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 61434487011 + ... + 61434490618.

It is an arithmetic number, because the mean of its divisors is an integer number (18061739711610).

Almost surely, 2^{221655635642716} is an apocalyptic number.

It is an amenable number.

221655635642716 is a deficient number, since it is larger than the sum of its proper divisors (211826117435924).

221655635642716 is a wasteful number, since it uses less digits than its factorization.

221655635642716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122868977685 (or 122868977683 counting only the distinct ones).

The product of its digits is 108864000, while the sum is 61.

The spelling of 221655635642716 in words is "two hundred twenty-one trillion, six hundred fifty-five billion, six hundred thirty-five million, six hundred forty-two thousand, seven hundred sixteen".