25023537128281 has 8 divisors (see below), whose sum is σ = 25131528292104. Its totient is φ = 24915551041920.

The previous prime is 25023537128273. The next prime is 25023537128287. The reversal of 25023537128281 is 18282173532052.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3659645520400 + 21363891607881 = 1913020^2 + 4622109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25023537128281 - 2³ = 25023537128273 is a prime.

It is a super-2 number, since 2×25023537128281² (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 (25023537128287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8779891 + ... + 11275351.

It is an arithmetic number, because the mean of its divisors is an integer number (3141441036513).

Almost surely, 2^{25023537128281} is an apocalyptic number.

It is an amenable number.

25023537128281 is a deficient number, since it is larger than the sum of its proper divisors (107991163823).

25023537128281 is a wasteful number, since it uses less digits than its factorization.

25023537128281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538731.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 25023537128281 in words is "twenty-five trillion, twenty-three billion, five hundred thirty-seven million, one hundred twenty-eight thousand, two hundred eighty-one".