25279040393 has 4 divisors (see below), whose sum is σ = 25285918980. Its totient is φ = 25272161808.

The previous prime is 25279040389. The next prime is 25279040407. The reversal of 25279040393 is 39304097252.

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 23909818384 + 1369222009 = 154628^2 + 37003^2 .

It is a cyclic number.

It is not a de Polignac number, because 25279040393 - 2² = 25279040389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25279040383) 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, 3433778 + ... + 3441131.

It is an arithmetic number, because the mean of its divisors is an integer number (6321479745).

Almost surely, 2^25279040393 is an apocalyptic number.

It is an amenable number.

25279040393 is a deficient number, since it is larger than the sum of its proper divisors (6878587).

25279040393 is an equidigital number, since it uses as much as digits as its factorization.

25279040393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878586.

The product of its (nonzero) digits is 408240, while the sum is 44.

The spelling of 25279040393 in words is "twenty-five billion, two hundred seventy-nine million, forty thousand, three hundred ninety-three".