2563403561 has 4 divisors (see below), whose sum is σ = 2564236500. Its totient is φ = 2562570624.

The previous prime is 2563403519. The next prime is 2563403569. The reversal of 2563403561 is 1653043652.

2563403561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2272905625 + 290497936 = 47675^2 + 17044^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563403561 - 2¹⁸ = 2563141417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2563403569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411836 + ... + 418013.

It is an arithmetic number, because the mean of its divisors is an integer number (641059125).

Almost surely, 2^2563403561 is an apocalyptic number.

It is an amenable number.

2563403561 is a deficient number, since it is larger than the sum of its proper divisors (832939).

2563403561 is an equidigital number, since it uses as much as digits as its factorization.

2563403561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832938.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 2563403561 is about 50630.0657811147. The cubic root of 2563403561 is about 1368.5867396416.

The spelling of 2563403561 in words is "two billion, five hundred sixty-three million, four hundred three thousand, five hundred sixty-one".