25849886840 has 64 divisors (see below), whose sum is σ = 61245504000. Its totient is φ = 9792213120.

The previous prime is 25849886833. The next prime is 25849886849. The reversal of 25849886840 is 4868894852.

It is a Cunningham number, because it is equal to 160779²-1.

It is a super-3 number, since 3×25849886840³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25849886849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3211541 + ... + 3219579.

It is an arithmetic number, because the mean of its divisors is an integer number (956961000).

Almost surely, 2^25849886840 is an apocalyptic number.

25849886840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25849886840 is an abundant number, since it is smaller than the sum of its proper divisors (35395617160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25849886840 is a wasteful number, since it uses less digits than its factorization.

25849886840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12300 (or 12296 counting only the distinct ones).

The product of its (nonzero) digits is 35389440, while the sum is 62.

The spelling of 25849886840 in words is "twenty-five billion, eight hundred forty-nine million, eight hundred eighty-six thousand, eight hundred forty".