221544150655693 has 2 divisors, whose sum is σ = 221544150655694. Its totient is φ = 221544150655692.

The previous prime is 221544150655643. The next prime is 221544150655721. The reversal of 221544150655693 is 396556051445122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221421453176169 + 122697479524 = 14880237^2 + 350282^2 .

It is a cyclic number.

It is not a de Polignac number, because 221544150655693 - 2²⁵ = 221544117101261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221544150655643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110772075327846 + 110772075327847.

It is an arithmetic number, because the mean of its divisors is an integer number (110772075327847).

Almost surely, 2^{221544150655693} is an apocalyptic number.

It is an amenable number.

221544150655693 is a deficient number, since it is larger than the sum of its proper divisors (1).

221544150655693 is an equidigital number, since it uses as much as digits as its factorization.

221544150655693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880000, while the sum is 58.

The spelling of 221544150655693 in words is "two hundred twenty-one trillion, five hundred forty-four billion, one hundred fifty million, six hundred fifty-five thousand, six hundred ninety-three".