25494873637906 has 4 divisors (see below), whose sum is σ = 38242310456862. Its totient is φ = 12747436818952.

The previous prime is 25494873637897. The next prime is 25494873637907. The reversal of 25494873637906 is 60973637849452.

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., 16647550579881 + 8847323058025 = 4080141^2 + 2974445^2 .

It is not an unprimeable number, because it can be changed into a prime (25494873637907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6373718409475 + ... + 6373718409478.

Almost surely, 2^{25494873637906} is an apocalyptic number.

25494873637906 is a deficient number, since it is larger than the sum of its proper divisors (12747436818956).

25494873637906 is a wasteful number, since it uses less digits than its factorization.

25494873637906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12747436818955.

The product of its (nonzero) digits is 1646023680, while the sum is 73.

The spelling of 25494873637906 in words is "twenty-five trillion, four hundred ninety-four billion, eight hundred seventy-three million, six hundred thirty-seven thousand, nine hundred six".