25731943493 has 4 divisors (see below), whose sum is σ = 25732800480. Its totient is φ = 25731086508.

The previous prime is 25731943487. The next prime is 25731943511. The reversal of 25731943493 is 39434913752.

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 25731943493 - 2⁶ = 25731943429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25731943403) 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, 381755 + ... + 444072.

It is an arithmetic number, because the mean of its divisors is an integer number (6433200120).

Almost surely, 2^25731943493 is an apocalyptic number.

It is an amenable number.

25731943493 is a deficient number, since it is larger than the sum of its proper divisors (856987).

25731943493 is an equidigital number, since it uses as much as digits as its factorization.

25731943493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856986.

The product of its digits is 2449440, while the sum is 50.

The spelling of 25731943493 in words is "twenty-five billion, seven hundred thirty-one million, nine hundred forty-three thousand, four hundred ninety-three".