25509548446 has 12 divisors (see below), whose sum is σ = 39929684472. Its totient is φ = 12199700744.

The previous prime is 25509548399. The next prime is 25509548489. The reversal of 25509548446 is 64484590552.

It is a junction number, because it is equal to n+sod(n) for n = 25509548393 and 25509548402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1071480 + ... + 1095028.

It is an arithmetic number, because the mean of its divisors is an integer number (3327473706).

Almost surely, 2^25509548446 is an apocalyptic number.

25509548446 is a deficient number, since it is larger than the sum of its proper divisors (14420136026).

25509548446 is an frugal number, since it uses more digits than its factorization.

25509548446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47123 (or 23574 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 52.

The spelling of 25509548446 in words is "twenty-five billion, five hundred nine million, five hundred forty-eight thousand, four hundred forty-six".