25152265681 has 4 divisors (see below), whose sum is σ = 25152701364. Its totient is φ = 25151830000.

The previous prime is 25152265669. The next prime is 25152265711. The reversal of 25152265681 is 18656225152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13136598225 + 12015667456 = 114615^2 + 109616^2 .

It is a cyclic number.

It is not a de Polignac number, because 25152265681 - 2¹⁵ = 25152232913 is a prime.

It is a super-2 number, since 2×25152265681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25152265651) 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 3 ways as a sum of consecutive naturals, for example, 115090 + ... + 252091.

It is an arithmetic number, because the mean of its divisors is an integer number (6288175341).

Almost surely, 2^25152265681 is an apocalyptic number.

It is an amenable number.

25152265681 is a deficient number, since it is larger than the sum of its proper divisors (435683).

25152265681 is an equidigital number, since it uses as much as digits as its factorization.

25152265681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435682.

The product of its digits is 288000, while the sum is 43.

The spelling of 25152265681 in words is "twenty-five billion, one hundred fifty-two million, two hundred sixty-five thousand, six hundred eighty-one".