25120064542 has 4 divisors (see below), whose sum is σ = 37680096816. Its totient is φ = 12560032270.

The previous prime is 25120064507. The next prime is 25120064561. The reversal of 25120064542 is 24546002152.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 6280016134 + ... + 6280016137.

It is an arithmetic number, because the mean of its divisors is an integer number (9420024204).

Almost surely, 2^25120064542 is an apocalyptic number.

25120064542 is a deficient number, since it is larger than the sum of its proper divisors (12560032274).

25120064542 is a wasteful number, since it uses less digits than its factorization.

25120064542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12560032273.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 25120064542 its reverse (24546002152), we get a palindrome (49666066694).

The spelling of 25120064542 in words is "twenty-five billion, one hundred twenty million, sixty-four thousand, five hundred forty-two".