221666025403 has 2 divisors, whose sum is σ = 221666025404. Its totient is φ = 221666025402.

The previous prime is 221666025391. The next prime is 221666025517. The reversal of 221666025403 is 304520666122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221666025403 is a prime.

It is not a weakly prime, because it can be changed into another prime (221666095403) 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 as a sum of consecutive naturals, namely, 110833012701 + 110833012702.

It is an arithmetic number, because the mean of its divisors is an integer number (110833012702).

Almost surely, 2^221666025403 is an apocalyptic number.

221666025403 is a deficient number, since it is larger than the sum of its proper divisors (1).

221666025403 is an equidigital number, since it uses as much as digits as its factorization.

221666025403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 221666025403 in words is "two hundred twenty-one billion, six hundred sixty-six million, twenty-five thousand, four hundred three".