25290247581481 has 9 divisors (see below), whose sum is σ = 25355494615269. Its totient is φ = 25225168056000.

The previous prime is 25290247581451. The next prime is 25290247581493. The reversal of 25290247581481 is 18418574209252.

The square root of 25290247581481 is 5028941.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 19955348713881 + 5334898867600 = 4467141^2 + 2309740^2 .

It is not a de Polignac number, because 25290247581481 - 2²³ = 25290239192873 is a prime.

It is a super-2 number, since 2×25290247581481² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25290247581421) 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 in 8 ways as a sum of consecutive naturals, for example, 2016599071 + ... + 2016611611.

Almost surely, 2^{25290247581481} is an apocalyptic number.

25290247581481 is the 5028941-st square number.

25290247581481 is the 2514471-st centered octagonal number.

It is an amenable number.

25290247581481 is a deficient number, since it is larger than the sum of its proper divisors (65247033788).

25290247581481 is an frugal number, since it uses more digits than its factorization.

25290247581481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25884 (or 12942 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 25290247581481 in words is "twenty-five trillion, two hundred ninety billion, two hundred forty-seven million, five hundred eighty-one thousand, four hundred eighty-one".