25563411612461 has 8 divisors (see below), whose sum is σ = 26430518088600. Its totient is φ = 24705579002688.

The previous prime is 25563411612449. The next prime is 25563411612509. The reversal of 25563411612461 is 16421611436552.

It can be written as a sum of positive squares in 4 ways, for example, as 238422241225 + 25324989371236 = 488285^2 + 5032394^2 .

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

It is not a de Polignac number, because 25563411612461 - 2¹⁸ = 25563411350317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25563411615461) 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, 2318460986 + ... + 2318472011.

It is an arithmetic number, because the mean of its divisors is an integer number (3303814761075).

Almost surely, 2^{25563411612461} is an apocalyptic number.

It is an amenable number.

25563411612461 is a deficient number, since it is larger than the sum of its proper divisors (867106476139).

25563411612461 is a wasteful number, since it uses less digits than its factorization.

25563411612461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636933183.

The product of its digits is 1036800, while the sum is 47.

The spelling of 25563411612461 in words is "twenty-five trillion, five hundred sixty-three billion, four hundred eleven million, six hundred twelve thousand, four hundred sixty-one".