2538285926581 has 2 divisors, whose sum is σ = 2538285926582. Its totient is φ = 2538285926580.

The previous prime is 2538285926551. The next prime is 2538285926591. The reversal of 2538285926581 is 1856295828352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2108277864081 + 430008062500 = 1451991^2 + 655750^2 .

It is a cyclic number.

It is not a de Polignac number, because 2538285926581 - 2¹⁷ = 2538285795509 is a prime.

It is a super-2 number, since 2×2538285926581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2538285926551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269142963290 + 1269142963291.

It is an arithmetic number, because the mean of its divisors is an integer number (1269142963291).

Almost surely, 2^{2538285926581} is an apocalyptic number.

It is an amenable number.

2538285926581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2538285926581 is an equidigital number, since it uses as much as digits as its factorization.

2538285926581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944000, while the sum is 64.

The spelling of 2538285926581 in words is "two trillion, five hundred thirty-eight billion, two hundred eighty-five million, nine hundred twenty-six thousand, five hundred eighty-one".