25136943889 has 4 divisors (see below), whose sum is σ = 25512122224. Its totient is φ = 24761765556.

The previous prime is 25136943859. The next prime is 25136943907. The reversal of 25136943889 is 98834963152.

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 25136943889 - 2²³ = 25128555281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25136943859) 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, 187589067 + ... + 187589200.

It is an arithmetic number, because the mean of its divisors is an integer number (6378030556).

Almost surely, 2^25136943889 is an apocalyptic number.

It is an amenable number.

25136943889 is a deficient number, since it is larger than the sum of its proper divisors (375178335).

25136943889 is an equidigital number, since it uses as much as digits as its factorization.

25136943889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375178334.

The product of its digits is 11197440, while the sum is 58.

The spelling of 25136943889 in words is "twenty-five billion, one hundred thirty-six million, nine hundred forty-three thousand, eight hundred eighty-nine".