25511956049 has 4 divisors (see below), whose sum is σ = 27012659364. Its totient is φ = 24011252736.

The previous prime is 25511956037. The next prime is 25511956069. The reversal of 25511956049 is 94065911552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18117160000 + 7394796049 = 134600^2 + 85993^2 .

It is a cyclic number.

It is not a de Polignac number, because 25511956049 - 2²⁴ = 25495178833 is a prime.

It is a super-2 number, since 2×25511956049² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25511955994 and 25511956012.

It is not an unprimeable number, because it can be changed into a prime (25511956069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750351632 + ... + 750351665.

It is an arithmetic number, because the mean of its divisors is an integer number (6753164841).

Almost surely, 2^25511956049 is an apocalyptic number.

It is an amenable number.

25511956049 is a deficient number, since it is larger than the sum of its proper divisors (1500703315).

25511956049 is a wasteful number, since it uses less digits than its factorization.

25511956049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500703314.

The product of its (nonzero) digits is 486000, while the sum is 47.

The spelling of 25511956049 in words is "twenty-five billion, five hundred eleven million, nine hundred fifty-six thousand, forty-nine".