25506711217 has 8 divisors (see below), whose sum is σ = 27470406824. Its totient is φ = 23543250048.

The previous prime is 25506711203. The next prime is 25506711257. The reversal of 25506711217 is 71211760552.

It can be written as a sum of positive squares in 4 ways, for example, as 279424656 + 25227286561 = 16716^2 + 158831^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25506711217 - 2²³ = 25498322609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25506711257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214543 + ... + 311515.

It is an arithmetic number, because the mean of its divisors is an integer number (3433800853).

Almost surely, 2^25506711217 is an apocalyptic number.

It is an amenable number.

25506711217 is a deficient number, since it is larger than the sum of its proper divisors (1963695607).

25506711217 is a wasteful number, since it uses less digits than its factorization.

25506711217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117219.

The product of its (nonzero) digits is 29400, while the sum is 37.

The spelling of 25506711217 in words is "twenty-five billion, five hundred six million, seven hundred eleven thousand, two hundred seventeen".