25279525449 has 12 divisors (see below), whose sum is σ = 36539916400. Its totient is φ = 16841457144.

The previous prime is 25279525433. The next prime is 25279525457. The reversal of 25279525449 is 94452597252.

25279525449 is a `hidden beast` number, since 2 + 5 + 2 + 7 + 95 + 2 + 544 + 9 = 666.

It is not a de Polignac number, because 25279525449 - 2⁴ = 25279525433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25279525395 and 25279525404.

It is not an unprimeable number, because it can be changed into a prime (25279524449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 949459 + ... + 975720.

Almost surely, 2^25279525449 is an apocalyptic number.

It is an amenable number.

25279525449 is a deficient number, since it is larger than the sum of its proper divisors (11260390951).

25279525449 is a wasteful number, since it uses less digits than its factorization.

25279525449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926644 (or 1926641 counting only the distinct ones).

The product of its digits is 9072000, while the sum is 54.

The spelling of 25279525449 in words is "twenty-five billion, two hundred seventy-nine million, five hundred twenty-five thousand, four hundred forty-nine".