1625123210261 has 2 divisors, whose sum is σ = 1625123210262. Its totient is φ = 1625123210260.

The previous prime is 1625123210237. The next prime is 1625123210297. The reversal of 1625123210261 is 1620123215261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1484910407761 + 140212802500 = 1218569^2 + 374450^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625123210261 - 2²² = 1625119015957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1625123210461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812561605130 + 812561605131.

It is an arithmetic number, because the mean of its divisors is an integer number (812561605131).

Almost surely, 2^{1625123210261} is an apocalyptic number.

It is an amenable number.

1625123210261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625123210261 is an equidigital number, since it uses as much as digits as its factorization.

1625123210261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 1625123210261 in words is "one trillion, six hundred twenty-five billion, one hundred twenty-three million, two hundred ten thousand, two hundred sixty-one".