2556142666 has 24 divisors (see below), whose sum is σ = 4816536480. Its totient is φ = 995899080.

The previous prime is 2556142649. The next prime is 2556142703. The reversal of 2556142666 is 6662416552.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 752776 + ... + 756163.

It is an arithmetic number, because the mean of its divisors is an integer number (200689020).

Almost surely, 2^2556142666 is an apocalyptic number.

2556142666 is a deficient number, since it is larger than the sum of its proper divisors (2260393814).

2556142666 is a wasteful number, since it uses less digits than its factorization.

2556142666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508970 (or 1508959 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The square root of 2556142666 is about 50558.3095643041. The cubic root of 2556142666 is about 1367.2933340085.

The spelling of 2556142666 in words is "two billion, five hundred fifty-six million, one hundred forty-two thousand, six hundred sixty-six".