623421251102161 has 2 divisors, whose sum is σ = 623421251102162. Its totient is φ = 623421251102160.

The previous prime is 623421251102113. The next prime is 623421251102197. The reversal of 623421251102161 is 161201152124326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384907358331136 + 238513892771025 = 19619056^2 + 15443895^2 .

It is a cyclic number.

It is not a de Polignac number, because 623421251102161 - 2¹³ = 623421251093969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 623421251102161.

It is not a weakly prime, because it can be changed into another prime (623421251102561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311710625551080 + 311710625551081.

It is an arithmetic number, because the mean of its divisors is an integer number (311710625551081).

Almost surely, 2^{623421251102161} is an apocalyptic number.

It is an amenable number.

623421251102161 is a deficient number, since it is larger than the sum of its proper divisors (1).

623421251102161 is an equidigital number, since it uses as much as digits as its factorization.

623421251102161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 623421251102161 in words is "six hundred twenty-three trillion, four hundred twenty-one billion, two hundred fifty-one million, one hundred two thousand, one hundred sixty-one".