25646044542 has 32 divisors (see below), whose sum is σ = 54033868800. Its totient is φ = 8092421568.

The previous prime is 25646044531. The next prime is 25646044547. The reversal of 25646044542 is 24544064652.

It is a junction number, because it is equal to n+sod(n) for n = 25646044494 and 25646044503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25646044547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59683 + ... + 234209.

It is an arithmetic number, because the mean of its divisors is an integer number (1688558400).

Almost surely, 2^25646044542 is an apocalyptic number.

25646044542 is an abundant number, since it is smaller than the sum of its proper divisors (28387824258).

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

25646044542 is a wasteful number, since it uses less digits than its factorization.

25646044542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175840.

The product of its (nonzero) digits is 921600, while the sum is 42.

The spelling of 25646044542 in words is "twenty-five billion, six hundred forty-six million, forty-four thousand, five hundred forty-two".