221554045469 has 2 divisors, whose sum is σ = 221554045470. Its totient is φ = 221554045468.

The previous prime is 221554045403. The next prime is 221554045481. The reversal of 221554045469 is 964540455122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218846196100 + 2707849369 = 467810^2 + 52037^2 .

It is a cyclic number.

It is not a de Polignac number, because 221554045469 - 2³² = 217259078173 is a prime.

It is a super-2 number, since 2×221554045469² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221554044469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110777022734 + 110777022735.

It is an arithmetic number, because the mean of its divisors is an integer number (110777022735).

Almost surely, 2^221554045469 is an apocalyptic number.

It is an amenable number.

221554045469 is a deficient number, since it is larger than the sum of its proper divisors (1).

221554045469 is an equidigital number, since it uses as much as digits as its factorization.

221554045469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 221554045469 in words is "two hundred twenty-one billion, five hundred fifty-four million, forty-five thousand, four hundred sixty-nine".