2645451668 has 36 divisors (see below), whose sum is σ = 4927184220. Its totient is φ = 1242565632.

The previous prime is 2645451667. The next prime is 2645451703. The reversal of 2645451668 is 8661545462.

It can be written as a sum of positive squares in 6 ways, for example, as 47306884 + 2598144784 = 6878^2 + 50972^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645451661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 711398 + ... + 715106.

Almost surely, 2^2645451668 is an apocalyptic number.

It is an amenable number.

2645451668 is a deficient number, since it is larger than the sum of its proper divisors (2281732552).

2645451668 is a wasteful number, since it uses less digits than its factorization.

2645451668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364 (or 4345 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 47.

The square root of 2645451668 is about 51433.9544270125. The cubic root of 2645451668 is about 1383.0353386983.

The spelling of 2645451668 in words is "two billion, six hundred forty-five million, four hundred fifty-one thousand, six hundred sixty-eight".