25538744783507 has 4 divisors (see below), whose sum is σ = 25538798488896. Its totient is φ = 25538691078120.

The previous prime is 25538744783501. The next prime is 25538744783603. The reversal of 25538744783507 is 70538744783552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25538744783507 - 2¹⁶ = 25538744717971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25538744783501) 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, 26132963 + ... + 27092604.

It is an arithmetic number, because the mean of its divisors is an integer number (6384699622224).

Almost surely, 2^{25538744783507} is an apocalyptic number.

25538744783507 is a deficient number, since it is larger than the sum of its proper divisors (53705389).

25538744783507 is an equidigital number, since it uses as much as digits as its factorization.

25538744783507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53705388.

The product of its (nonzero) digits is 790272000, while the sum is 68.

The spelling of 25538744783507 in words is "twenty-five trillion, five hundred thirty-eight billion, seven hundred forty-four million, seven hundred eighty-three thousand, five hundred seven".