2556378877 has 18 divisors (see below), whose sum is σ = 2836925658. Its totient is φ = 2289899808.

The previous prime is 2556378871. The next prime is 2556378889. The reversal of 2556378877 is 7788736552.

It can be written as a sum of positive squares in 3 ways, for example, as 942428601 + 1613950276 = 30699^2 + 40174^2 .

It is not a de Polignac number, because 2556378877 - 2¹¹ = 2556376829 is a prime.

It is a super-2 number, since 2×2556378877² = 13070145925543562258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556378871) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6744874 + ... + 6745252.

It is an arithmetic number, because the mean of its divisors is an integer number (157606981).

Almost surely, 2^2556378877 is an apocalyptic number.

It is an amenable number.

2556378877 is a deficient number, since it is larger than the sum of its proper divisors (280546781).

2556378877 is an frugal number, since it uses more digits than its factorization.

2556378877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 429 counting only the distinct ones).

The product of its digits is 19756800, while the sum is 58.

The square root of 2556378877 is about 50560.6455358315. The cubic root of 2556378877 is about 1367.3354495213.

The spelling of 2556378877 in words is "two billion, five hundred fifty-six million, three hundred seventy-eight thousand, eight hundred seventy-seven".