25643130511 has 4 divisors (see below), whose sum is σ = 25648156792. Its totient is φ = 25638104232.

The previous prime is 25643130427. The next prime is 25643130521. The reversal of 25643130511 is 11503134652.

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

It is a cyclic number.

It is not a de Polignac number, because 25643130511 - 2¹¹ = 25643128463 is a prime.

It is a super-2 number, since 2×25643130511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643130521) 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, 2505480 + ... + 2515693.

It is an arithmetic number, because the mean of its divisors is an integer number (6412039198).

Almost surely, 2^25643130511 is an apocalyptic number.

25643130511 is a deficient number, since it is larger than the sum of its proper divisors (5026281).

25643130511 is an equidigital number, since it uses as much as digits as its factorization.

25643130511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5026280.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 25643130511 in words is "twenty-five billion, six hundred forty-three million, one hundred thirty thousand, five hundred eleven".