25809819123948 has 12 divisors (see below), whose sum is σ = 60222911289240. Its totient is φ = 8603273041312.

The previous prime is 25809819123923. The next prime is 25809819123953. The reversal of 25809819123948 is 84932191890852.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×25809819123948² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075409130153 + ... + 1075409130176.

It is an arithmetic number, because the mean of its divisors is an integer number (5018575940770).

Almost surely, 2^{25809819123948} is an apocalyptic number.

It is an amenable number.

25809819123948 is an abundant number, since it is smaller than the sum of its proper divisors (34413092165292).

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

25809819123948 is a wasteful number, since it uses less digits than its factorization.

25809819123948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150818260336 (or 2150818260334 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 69.

The spelling of 25809819123948 in words is "twenty-five trillion, eight hundred nine billion, eight hundred nineteen million, one hundred twenty-three thousand, nine hundred forty-eight".