25857061642 has 16 divisors (see below), whose sum is σ = 41081401152. Its totient is φ = 12163791040.

The previous prime is 25857061619. The next prime is 25857061649. The reversal of 25857061642 is 24616075852.

It is a junction number, because it is equal to n+sod(n) for n = 25857061592 and 25857061601.

It is not an unprimeable number, because it can be changed into a prime (25857061649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32284 + ... + 229687.

It is an arithmetic number, because the mean of its divisors is an integer number (2567587572).

Almost surely, 2^25857061642 is an apocalyptic number.

25857061642 is a deficient number, since it is larger than the sum of its proper divisors (15224339510).

25857061642 is a wasteful number, since it uses less digits than its factorization.

25857061642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264893.

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 25857061642 in words is "twenty-five billion, eight hundred fifty-seven million, sixty-one thousand, six hundred forty-two".