25780755505 has 8 divisors (see below), whose sum is σ = 31243213224. Its totient is φ = 20420400000.

The previous prime is 25780755421. The next prime is 25780755509. The reversal of 25780755505 is 50555708752.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15258919729 + 10521835776 = 123527^2 + 102576^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25780755505 - 2¹⁷ = 25780624433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25780755509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25524996 + ... + 25526005.

It is an arithmetic number, because the mean of its divisors is an integer number (3905401653).

Almost surely, 2^25780755505 is an apocalyptic number.

It is an amenable number.

25780755505 is a deficient number, since it is larger than the sum of its proper divisors (5462457719).

25780755505 is a wasteful number, since it uses less digits than its factorization.

25780755505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51051107.

The product of its (nonzero) digits is 2450000, while the sum is 49.

The spelling of 25780755505 in words is "twenty-five billion, seven hundred eighty million, seven hundred fifty-five thousand, five hundred five".