221564400546654 has 48 divisors (see below), whose sum is σ = 523720666984320. Its totient is φ = 67137779622480.

The previous prime is 221564400546649. The next prime is 221564400546661. The reversal of 221564400546654 is 456645004465122.

221564400546654 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 6 + 4 + 40 + 0 + 546 + 6 + 54 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 221564400546654.

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, 20041914 + ... + 29065565.

It is an arithmetic number, because the mean of its divisors is an integer number (10910847228840).

Almost surely, 2^{221564400546654} is an apocalyptic number.

221564400546654 is an abundant number, since it is smaller than the sum of its proper divisors (302156266437666).

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

221564400546654 is a wasteful number, since it uses less digits than its factorization.

221564400546654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49130285 (or 49130282 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 54.

The spelling of 221564400546654 in words is "two hundred twenty-one trillion, five hundred sixty-four billion, four hundred million, five hundred forty-six thousand, six hundred fifty-four".