25781318471 has 4 divisors (see below), whose sum is σ = 25781641632. Its totient is φ = 25780995312.

The previous prime is 25781318419. The next prime is 25781318561. The reversal of 25781318471 is 17481318752.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25781318471 - 2³⁴ = 8601449287 is a prime.

It is a super-3 number, since 3×25781318471³ (a number of 32 digits) contains 333 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 (25781318071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53675 + ... + 233331.

It is an arithmetic number, because the mean of its divisors is an integer number (6445410408).

Almost surely, 2^25781318471 is an apocalyptic number.

25781318471 is a deficient number, since it is larger than the sum of its proper divisors (323161).

25781318471 is a wasteful number, since it uses less digits than its factorization.

25781318471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323160.

The product of its digits is 376320, while the sum is 47.

The spelling of 25781318471 in words is "twenty-five billion, seven hundred eighty-one million, three hundred eighteen thousand, four hundred seventy-one".