25642553542 has 4 divisors (see below), whose sum is σ = 38463830316. Its totient is φ = 12821276770.

The previous prime is 25642553471. The next prime is 25642553597. The reversal of 25642553542 is 24535524652.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410638384 + ... + 6410638387.

It is an arithmetic number, because the mean of its divisors is an integer number (9615957579).

Almost surely, 2^25642553542 is an apocalyptic number.

25642553542 is a deficient number, since it is larger than the sum of its proper divisors (12821276774).

25642553542 is a wasteful number, since it uses less digits than its factorization.

25642553542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12821276773.

The product of its digits is 1440000, while the sum is 43.

The spelling of 25642553542 in words is "twenty-five billion, six hundred forty-two million, five hundred fifty-three thousand, five hundred forty-two".