2556149009 has 4 divisors (see below), whose sum is σ = 2556276720. Its totient is φ = 2556021300.

The previous prime is 2556148997. The next prime is 2556149023. The reversal of 2556149009 is 9009416552.

2556149009 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2556149009 - 2⁴ = 2556148993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2556149069) 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, 26579 + ... + 76280.

It is an arithmetic number, because the mean of its divisors is an integer number (639069180).

Almost surely, 2^2556149009 is an apocalyptic number.

It is an amenable number.

2556149009 is a deficient number, since it is larger than the sum of its proper divisors (127711).

2556149009 is a wasteful number, since it uses less digits than its factorization.

2556149009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127710.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 2556149009 is about 50558.3722938150. The cubic root of 2556149009 is about 1367.2944649749.

The spelling of 2556149009 in words is "two billion, five hundred fifty-six million, one hundred forty-nine thousand, nine".