25649398871880 has 128 divisors (see below), whose sum is σ = 87992258515200. Its totient is φ = 5859288916992.

The previous prime is 25649398871839. The next prime is 25649398871903. The reversal of 25649398871880 is 8817889394652.

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 25649398871796 and 25649398871805.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7498027 + ... + 10369146.

It is an arithmetic number, because the mean of its divisors is an integer number (687439519650).

It is a 2-persistent number, because it is pandigital, and so is 2⋅25649398871880 = 51298797743760, but 3⋅25649398871880 = 76948196615640 is not.

Almost surely, 2^{25649398871880} is an apocalyptic number.

25649398871880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25649398871880 is an abundant number, since it is smaller than the sum of its proper divisors (62342859643320).

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

25649398871880 is a wasteful number, since it uses less digits than its factorization.

25649398871880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17868903 (or 17868899 counting only the distinct ones).

The product of its (nonzero) digits is 1672151040, while the sum is 78.

The spelling of 25649398871880 in words is "twenty-five trillion, six hundred forty-nine billion, three hundred ninety-eight million, eight hundred seventy-one thousand, eight hundred eighty".