252666558226921 has 2 divisors, whose sum is σ = 252666558226922. Its totient is φ = 252666558226920.

The previous prime is 252666558226799. The next prime is 252666558226931. The reversal of 252666558226921 is 129622855666252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170309390469696 + 82357167757225 = 13050264^2 + 9075085^2 .

It is a cyclic number.

It is not a de Polignac number, because 252666558226921 - 2⁷ = 252666558226793 is a prime.

It is not a weakly prime, because it can be changed into another prime (252666558226931) 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, 126333279113460 + 126333279113461.

It is an arithmetic number, because the mean of its divisors is an integer number (126333279113461).

Almost surely, 2^{252666558226921} is an apocalyptic number.

It is an amenable number.

252666558226921 is a deficient number, since it is larger than the sum of its proper divisors (1).

252666558226921 is an equidigital number, since it uses as much as digits as its factorization.

252666558226921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248000, while the sum is 67.

The spelling of 252666558226921 in words is "two hundred fifty-two trillion, six hundred sixty-six billion, five hundred fifty-eight million, two hundred twenty-six thousand, nine hundred twenty-one".