26243252621 has 2 divisors, whose sum is σ = 26243252622. Its totient is φ = 26243252620.

The previous prime is 26243252591. The next prime is 26243252669. The reversal of 26243252621 is 12625234262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14834022025 + 11409230596 = 121795^2 + 106814^2 .

It is a cyclic number.

It is not a de Polignac number, because 26243252621 - 2³⁰ = 25169510797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26243252671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13121626310 + 13121626311.

It is an arithmetic number, because the mean of its divisors is an integer number (13121626311).

Almost surely, 2^26243252621 is an apocalyptic number.

It is an amenable number.

26243252621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26243252621 is an equidigital number, since it uses as much as digits as its factorization.

26243252621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 35.

Adding to 26243252621 its reverse (12625234262), we get a palindrome (38868486883).

The spelling of 26243252621 in words is "twenty-six billion, two hundred forty-three million, two hundred fifty-two thousand, six hundred twenty-one".