25606452601561 has 8 divisors (see below), whose sum is σ = 28028248245704. Its totient is φ = 23249238174720.

The previous prime is 25606452601547. The next prime is 25606452601603. The reversal of 25606452601561 is 16510625460652.

It can be written as a sum of positive squares in 4 ways, for example, as 4537939499536 + 21068513102025 = 2130244^2 + 4590045^2 .

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 25606452601561 - 2³⁹ = 25056696787673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25606452001561) 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, 16145303496 + ... + 16145305081.

It is an arithmetic number, because the mean of its divisors is an integer number (3503531030713).

Almost surely, 2^{25606452601561} is an apocalyptic number.

It is an amenable number.

25606452601561 is a deficient number, since it is larger than the sum of its proper divisors (2421795644143).

25606452601561 is a wasteful number, since it uses less digits than its factorization.

25606452601561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32290608651.

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 25606452601561 in words is "twenty-five trillion, six hundred six billion, four hundred fifty-two million, six hundred one thousand, five hundred sixty-one".