26457607621 has 2 divisors, whose sum is σ = 26457607622. Its totient is φ = 26457607620.

The previous prime is 26457607619. The next prime is 26457607651. The reversal of 26457607621 is 12670675462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22684576996 + 3773030625 = 150614^2 + 61425^2 .

It is a cyclic number.

It is not a de Polignac number, because 26457607621 - 2¹ = 26457607619 is a prime.

Together with 26457607619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26457607601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13228803810 + 13228803811.

It is an arithmetic number, because the mean of its divisors is an integer number (13228803811).

Almost surely, 2^26457607621 is an apocalyptic number.

It is an amenable number.

26457607621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26457607621 is an equidigital number, since it uses as much as digits as its factorization.

26457607621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 26457607621 in words is "twenty-six billion, four hundred fifty-seven million, six hundred seven thousand, six hundred twenty-one".