25166242642 has 4 divisors (see below), whose sum is σ = 37749363966. Its totient is φ = 12583121320.

The previous prime is 25166242631. The next prime is 25166242643. The reversal of 25166242642 is 24624266152.

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., 17975033041 + 7191209601 = 134071^2 + 84801^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25166242595 and 25166242604.

It is not an unprimeable number, because it can be changed into a prime (25166242643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6291560659 + ... + 6291560662.

Almost surely, 2^25166242642 is an apocalyptic number.

25166242642 is a deficient number, since it is larger than the sum of its proper divisors (12583121324).

25166242642 is a wasteful number, since it uses less digits than its factorization.

25166242642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12583121323.

The product of its digits is 276480, while the sum is 40.

The spelling of 25166242642 in words is "twenty-five billion, one hundred sixty-six million, two hundred forty-two thousand, six hundred forty-two".