2668637842 has 16 divisors (see below), whose sum is σ = 4315516632. Its totient is φ = 1230353280.

The previous prime is 2668637831. The next prime is 2668637843. The reversal of 2668637842 is 2487368662.

It can be written as a sum of positive squares in 4 ways, for example, as 584624041 + 2084013801 = 24179^2 + 45651^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2668637842.

It is not an unprimeable number, because it can be changed into a prime (2668637843) 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, 30409 + ... + 79132.

Almost surely, 2^2668637842 is an apocalyptic number.

2668637842 is a deficient number, since it is larger than the sum of its proper divisors (1646878790).

2668637842 is a wasteful number, since it uses less digits than its factorization.

2668637842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110493.

The product of its digits is 4644864, while the sum is 52.

The square root of 2668637842 is about 51658.8602468154. The cubic root of 2668637842 is about 1387.0641487062.

The spelling of 2668637842 in words is "two billion, six hundred sixty-eight million, six hundred thirty-seven thousand, eight hundred forty-two".