2531563661 has 16 divisors (see below), whose sum is σ = 2806368768. Its totient is φ = 2264430000.

The previous prime is 2531563651. The next prime is 2531563753. The reversal of 2531563661 is 1663651352.

It is a cyclic number.

It is not a de Polignac number, because 2531563661 - 2⁶ = 2531563597 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 (2531563631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223640 + ... + 234686.

It is an arithmetic number, because the mean of its divisors is an integer number (175398048).

Almost surely, 2^2531563661 is an apocalyptic number.

It is an amenable number.

2531563661 is a deficient number, since it is larger than the sum of its proper divisors (274805107).

2531563661 is a wasteful number, since it uses less digits than its factorization.

2531563661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11392.

The product of its digits is 97200, while the sum is 38.

The square root of 2531563661 is about 50314.6465852638. The cubic root of 2531563661 is about 1362.8967346312.

The spelling of 2531563661 in words is "two billion, five hundred thirty-one million, five hundred sixty-three thousand, six hundred sixty-one".