25572843949 has 4 divisors (see below), whose sum is σ = 25599290464. Its totient is φ = 25546397436.

The previous prime is 25572843841. The next prime is 25572843979. The reversal of 25572843949 is 94934827552.

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.

It is a cyclic number.

It is not a de Polignac number, because 25572843949 - 2²⁹ = 25035973037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25572843893 and 25572843902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25572843979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13221807 + ... + 13223740.

It is an arithmetic number, because the mean of its divisors is an integer number (6399822616).

Almost surely, 2^25572843949 is an apocalyptic number.

It is an amenable number.

25572843949 is a deficient number, since it is larger than the sum of its proper divisors (26446515).

25572843949 is an equidigital number, since it uses as much as digits as its factorization.

25572843949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26446514.

The product of its digits is 21772800, while the sum is 58.

The spelling of 25572843949 in words is "twenty-five billion, five hundred seventy-two million, eight hundred forty-three thousand, nine hundred forty-nine".