2563141661 has 4 divisors (see below), whose sum is σ = 2606584800. Its totient is φ = 2519698524.

The previous prime is 2563141547. The next prime is 2563141673. The reversal of 2563141661 is 1661413652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2563141661 - 2¹⁴ = 2563125277 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 (2563141681) 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, 21721481 + ... + 21721598.

It is an arithmetic number, because the mean of its divisors is an integer number (651646200).

Almost surely, 2^2563141661 is an apocalyptic number.

It is an amenable number.

2563141661 is a deficient number, since it is larger than the sum of its proper divisors (43443139).

2563141661 is an equidigital number, since it uses as much as digits as its factorization.

2563141661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43443138.

The product of its digits is 25920, while the sum is 35.

The square root of 2563141661 is about 50627.4793071905. The cubic root of 2563141661 is about 1368.5401290753.

The spelling of 2563141661 in words is "two billion, five hundred sixty-three million, one hundred forty-one thousand, six hundred sixty-one".