25545035242 has 4 divisors (see below), whose sum is σ = 38317552866. Its totient is φ = 12772517620.

The previous prime is 25545035237. The next prime is 25545035249. The reversal of 25545035242 is 24253054552.

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

It can be written as a sum of positive squares in only one way, i.e., 25119397081 + 425638161 = 158491^2 + 20631^2 .

It is not an unprimeable number, because it can be changed into a prime (25545035249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6386258809 + ... + 6386258812.

Almost surely, 2^25545035242 is an apocalyptic number.

25545035242 is a deficient number, since it is larger than the sum of its proper divisors (12772517624).

25545035242 is a wasteful number, since it uses less digits than its factorization.

25545035242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12772517623.

The product of its (nonzero) digits is 240000, while the sum is 37.

Adding to 25545035242 its reverse (24253054552), we get a palindrome (49798089794).

The spelling of 25545035242 in words is "twenty-five billion, five hundred forty-five million, thirty-five thousand, two hundred forty-two".