221646257673077 has 2 divisors, whose sum is σ = 221646257673078. Its totient is φ = 221646257673076.

The previous prime is 221646257672977. The next prime is 221646257673107. The reversal of 221646257673077 is 770376752646122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214716680529796 + 6929577143281 = 14653214^2 + 2632409^2 .

It is a cyclic number.

It is not a de Polignac number, because 221646257673077 - 2²⁴ = 221646240895861 is a prime.

It is a super-2 number, since 2×221646257673077² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221646257673877) 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, 110823128836538 + 110823128836539.

It is an arithmetic number, because the mean of its divisors is an integer number (110823128836539).

Almost surely, 2^{221646257673077} is an apocalyptic number.

It is an amenable number.

221646257673077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221646257673077 is an equidigital number, since it uses as much as digits as its factorization.

221646257673077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248935680, while the sum is 65.

The spelling of 221646257673077 in words is "two hundred twenty-one trillion, six hundred forty-six billion, two hundred fifty-seven million, six hundred seventy-three thousand, seventy-seven".