25262917621 has 2 divisors, whose sum is σ = 25262917622. Its totient is φ = 25262917620.

The previous prime is 25262917549. The next prime is 25262917657. The reversal of 25262917621 is 12671926252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21261722596 + 4001195025 = 145814^2 + 63255^2 .

It is a cyclic number.

It is not a de Polignac number, because 25262917621 - 2¹⁵ = 25262884853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25262917681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12631458810 + 12631458811.

It is an arithmetic number, because the mean of its divisors is an integer number (12631458811).

Almost surely, 2^25262917621 is an apocalyptic number.

It is an amenable number.

25262917621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25262917621 is an equidigital number, since it uses as much as digits as its factorization.

25262917621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The spelling of 25262917621 in words is "twenty-five billion, two hundred sixty-two million, nine hundred seventeen thousand, six hundred twenty-one".