2547651668 has 12 divisors (see below), whose sum is σ = 4463826612. Its totient is φ = 1272272640.

The previous prime is 2547651661. The next prime is 2547651679. The reversal of 2547651668 is 8661567452.

It can be written as a sum of positive squares in 2 ways, for example, as 1796233924 + 751417744 = 42382^2 + 27412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2547651661) 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, 384605 + ... + 391172.

It is an arithmetic number, because the mean of its divisors is an integer number (371985551).

Almost surely, 2^2547651668 is an apocalyptic number.

It is an amenable number.

2547651668 is a deficient number, since it is larger than the sum of its proper divisors (1916174944).

2547651668 is a wasteful number, since it uses less digits than its factorization.

2547651668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776602 (or 776600 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 50.

The square root of 2547651668 is about 50474.2673844802. The cubic root of 2547651668 is about 1365.7776956318. Note that the first 3 decimals are identical.

The spelling of 2547651668 in words is "two billion, five hundred forty-seven million, six hundred fifty-one thousand, six hundred sixty-eight".