2531664668 has 24 divisors (see below), whose sum is σ = 4777462368. Its totient is φ = 1166930496.

The previous prime is 2531664661. The next prime is 2531664673. The reversal of 2531664668 is 8664661352.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531664661) 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, 8705 + ... + 71687.

It is an arithmetic number, because the mean of its divisors is an integer number (199060932).

Almost surely, 2^2531664668 is an apocalyptic number.

It is an amenable number.

2531664668 is a deficient number, since it is larger than the sum of its proper divisors (2245797700).

2531664668 is a wasteful number, since it uses less digits than its factorization.

2531664668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63773 (or 63771 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 47.

The square root of 2531664668 is about 50315.6503286999. The cubic root of 2531664668 is about 1362.9148604878.

The spelling of 2531664668 in words is "two billion, five hundred thirty-one million, six hundred sixty-four thousand, six hundred sixty-eight".