221640303563766 has 48 divisors (see below), whose sum is σ = 488230976561328. Its totient is φ = 72648428558400.

The previous prime is 221640303563729. The next prime is 221640303563801. The reversal of 221640303563766 is 667365303046122.

221640303563766 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 4 + 0 + 3 + 0 + 3 + 563 + 76 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24614976 + ... + 32391011.

It is an arithmetic number, because the mean of its divisors is an integer number (10171478678361).

Almost surely, 2^{221640303563766} is an apocalyptic number.

221640303563766 is an abundant number, since it is smaller than the sum of its proper divisors (266590672997562).

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

221640303563766 is a wasteful number, since it uses less digits than its factorization.

221640303563766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57009597 (or 57009594 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 54.

The spelling of 221640303563766 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred three million, five hundred sixty-three thousand, seven hundred sixty-six".