25378944049 has 4 divisors (see below), whose sum is σ = 25379276800. Its totient is φ = 25378611300.

The previous prime is 25378944047. The next prime is 25378944083. The reversal of 25378944049 is 94044987352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25378944049 - 2¹ = 25378944047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25378944047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11224 + ... + 225574.

It is an arithmetic number, because the mean of its divisors is an integer number (6344819200).

Almost surely, 2^25378944049 is an apocalyptic number.

It is an amenable number.

25378944049 is a deficient number, since it is larger than the sum of its proper divisors (332751).

25378944049 is a wasteful number, since it uses less digits than its factorization.

25378944049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332750.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 25378944049 in words is "twenty-five billion, three hundred seventy-eight million, nine hundred forty-four thousand, forty-nine".