25711361281 has 4 divisors (see below), whose sum is σ = 26540760064. Its totient is φ = 24881962500.

The previous prime is 25711361243. The next prime is 25711361303. The reversal of 25711361281 is 18216311752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25711361281 - 2³³ = 17121426689 is a prime.

It is a super-2 number, since 2×25711361281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25711361281.

It is not an unprimeable number, because it can be changed into a prime (25711361881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414699345 + ... + 414699406.

It is an arithmetic number, because the mean of its divisors is an integer number (6635190016).

Almost surely, 2^25711361281 is an apocalyptic number.

It is an amenable number.

25711361281 is a deficient number, since it is larger than the sum of its proper divisors (829398783).

25711361281 is an equidigital number, since it uses as much as digits as its factorization.

25711361281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829398782.

The product of its digits is 20160, while the sum is 37.

The spelling of 25711361281 in words is "twenty-five billion, seven hundred eleven million, three hundred sixty-one thousand, two hundred eighty-one".