25881049691 has 8 divisors (see below), whose sum is σ = 29607039744. Its totient is φ = 22162233960.

The previous prime is 25881049687. The next prime is 25881049693. The reversal of 25881049691 is 19694018852.

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 25881049691 - 2² = 25881049687 is a prime.

It is a super-2 number, since 2×25881049691² (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 (25881049693) 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 7 ways as a sum of consecutive naturals, for example, 1785845 + ... + 1800278.

It is an arithmetic number, because the mean of its divisors is an integer number (3700879968).

Almost surely, 2^25881049691 is an apocalyptic number.

25881049691 is a deficient number, since it is larger than the sum of its proper divisors (3725990053).

25881049691 is a wasteful number, since it uses less digits than its factorization.

25881049691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587161.

The product of its (nonzero) digits is 1244160, while the sum is 53.

The spelling of 25881049691 in words is "twenty-five billion, eight hundred eighty-one million, forty-nine thousand, six hundred ninety-one".