25206557755 has 4 divisors (see below), whose sum is σ = 30247869312. Its totient is φ = 20165246200.

The previous prime is 25206557699. The next prime is 25206557771. The reversal of 25206557755 is 55775560252.

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

It is not a de Polignac number, because 25206557755 - 2⁷ = 25206557627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25206557699 and 25206557708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2520655771 + ... + 2520655780.

It is an arithmetic number, because the mean of its divisors is an integer number (7561967328).

Almost surely, 2^25206557755 is an apocalyptic number.

25206557755 is a deficient number, since it is larger than the sum of its proper divisors (5041311557).

25206557755 is an equidigital number, since it uses as much as digits as its factorization.

25206557755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041311556.

The product of its (nonzero) digits is 3675000, while the sum is 49.

The spelling of 25206557755 in words is "twenty-five billion, two hundred six million, five hundred fifty-seven thousand, seven hundred fifty-five".