25948630621 has 2 divisors, whose sum is σ = 25948630622. Its totient is φ = 25948630620.

The previous prime is 25948630571. The next prime is 25948630627. The reversal of 25948630621 is 12603684952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22594599225 + 3354031396 = 150315^2 + 57914^2 .

It is a cyclic number.

It is not a de Polignac number, because 25948630621 - 2¹³ = 25948622429 is a prime.

It is a super-2 number, since 2×25948630621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25948630627) 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, 12974315310 + 12974315311.

It is an arithmetic number, because the mean of its divisors is an integer number (12974315311).

Almost surely, 2^25948630621 is an apocalyptic number.

It is an amenable number.

25948630621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25948630621 is an equidigital number, since it uses as much as digits as its factorization.

25948630621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 25948630621 in words is "twenty-five billion, nine hundred forty-eight million, six hundred thirty thousand, six hundred twenty-one".