2556640797 has 8 divisors (see below), whose sum is σ = 3413009760. Its totient is φ = 1702349520.

The previous prime is 2556640781. The next prime is 2556640799. The reversal of 2556640797 is 7970466552.

2556640797 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2556640797 - 2⁴ = 2556640781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556640799) 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, 516547 + ... + 521472.

It is an arithmetic number, because the mean of its divisors is an integer number (426626220).

Almost surely, 2^2556640797 is an apocalyptic number.

It is an amenable number.

2556640797 is a deficient number, since it is larger than the sum of its proper divisors (856368963).

2556640797 is a wasteful number, since it uses less digits than its factorization.

2556640797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038843.

The product of its (nonzero) digits is 3175200, while the sum is 51.

The square root of 2556640797 is about 50563.2356262927. The cubic root of 2556640797 is about 1367.3821458168.

The spelling of 2556640797 in words is "two billion, five hundred fifty-six million, six hundred forty thousand, seven hundred ninety-seven".