25436427409 has 4 divisors (see below), whose sum is σ = 25437303360. Its totient is φ = 25435551460.

The previous prime is 25436427391. The next prime is 25436427413. The reversal of 25436427409 is 90472463452.

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 25436427409 - 2⁷ = 25436427281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25436427439) 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, 392869 + ... + 453010.

It is an arithmetic number, because the mean of its divisors is an integer number (6359325840).

Almost surely, 2^25436427409 is an apocalyptic number.

It is an amenable number.

25436427409 is a deficient number, since it is larger than the sum of its proper divisors (875951).

25436427409 is an equidigital number, since it uses as much as digits as its factorization.

25436427409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875950.

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 25436427409 in words is "twenty-five billion, four hundred thirty-six million, four hundred twenty-seven thousand, four hundred nine".