25641764542 has 8 divisors (see below), whose sum is σ = 38949516000. Its totient is φ = 12658592544.

The previous prime is 25641764539. The next prime is 25641764549. The reversal of 25641764542 is 24546714652.

25641764542 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 25641764492 and 25641764501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25641764549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81144667 + ... + 81144982.

It is an arithmetic number, because the mean of its divisors is an integer number (4868689500).

Almost surely, 2^25641764542 is an apocalyptic number.

25641764542 is a deficient number, since it is larger than the sum of its proper divisors (13307751458).

25641764542 is a wasteful number, since it uses less digits than its factorization.

25641764542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162289730.

The product of its digits is 1612800, while the sum is 46.

The spelling of 25641764542 in words is "twenty-five billion, six hundred forty-one million, seven hundred sixty-four thousand, five hundred forty-two".