25124542405 has 4 divisors (see below), whose sum is σ = 30149450892. Its totient is φ = 20099633920.

The previous prime is 25124542393. The next prime is 25124542409. The reversal of 25124542405 is 50424542152.

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 19486484836 + 5638057569 = 139594^2 + 75087^2 .

It is not a de Polignac number, because 25124542405 - 2²⁷ = 24990324677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25124542409) 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, 2512454236 + ... + 2512454245.

It is an arithmetic number, because the mean of its divisors is an integer number (7537362723).

Almost surely, 2^25124542405 is an apocalyptic number.

It is an amenable number.

25124542405 is a deficient number, since it is larger than the sum of its proper divisors (5024908487).

25124542405 is an equidigital number, since it uses as much as digits as its factorization.

25124542405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024908486.

The product of its (nonzero) digits is 64000, while the sum is 34.

The spelling of 25124542405 in words is "twenty-five billion, one hundred twenty-four million, five hundred forty-two thousand, four hundred five".