2556597947 has 4 divisors (see below), whose sum is σ = 2610993696. Its totient is φ = 2502202200.

The previous prime is 2556597937. The next prime is 2556598001. The reversal of 2556597947 is 7497956552.

It is a happy number.

2556597947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2556597947 - 2¹⁰ = 2556596923 is a prime.

It is a super-2 number, since 2×2556597947² = 13072386125209229618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556597937) 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, 27197804 + ... + 27197897.

It is an arithmetic number, because the mean of its divisors is an integer number (652748424).

Almost surely, 2^2556597947 is an apocalyptic number.

2556597947 is a deficient number, since it is larger than the sum of its proper divisors (54395749).

2556597947 is an equidigital number, since it uses as much as digits as its factorization.

2556597947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54395748.

The product of its digits is 23814000, while the sum is 59.

The square root of 2556597947 is about 50562.8118976783. The cubic root of 2556597947 is about 1367.3745065411.

The spelling of 2556597947 in words is "two billion, five hundred fifty-six million, five hundred ninety-seven thousand, nine hundred forty-seven".