2556766747 has 8 divisors (see below), whose sum is σ = 2577564000. Its totient is φ = 2536000704.

The previous prime is 2556766739. The next prime is 2556766753. The reversal of 2556766747 is 7476676552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2556766747 - 2³ = 2556766739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556764747) 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, 173629 + ... + 187777.

It is an arithmetic number, because the mean of its divisors is an integer number (322195500).

Almost surely, 2^2556766747 is an apocalyptic number.

2556766747 is a deficient number, since it is larger than the sum of its proper divisors (20797253).

2556766747 is a wasteful number, since it uses less digits than its factorization.

2556766747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15605.

The product of its digits is 14817600, while the sum is 55.

The square root of 2556766747 is about 50564.4810810909. The cubic root of 2556766747 is about 1367.4045996233.

The spelling of 2556766747 in words is "two billion, five hundred fifty-six million, seven hundred sixty-six thousand, seven hundred forty-seven".