2557780856 has 8 divisors (see below), whose sum is σ = 4795839120. Its totient is φ = 1278890424.

The previous prime is 2557780853. The next prime is 2557780861. The reversal of 2557780856 is 6580877552.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2557780798 and 2557780807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557780853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159861296 + ... + 159861311.

It is an arithmetic number, because the mean of its divisors is an integer number (599479890).

Almost surely, 2^2557780856 is an apocalyptic number.

It is an amenable number.

2557780856 is a deficient number, since it is larger than the sum of its proper divisors (2238058264).

2557780856 is a wasteful number, since it uses less digits than its factorization.

2557780856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319722613 (or 319722609 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 53.

The square root of 2557780856 is about 50574.5079659704. The cubic root of 2557780856 is about 1367.5853636051.

The spelling of 2557780856 in words is "two billion, five hundred fifty-seven million, seven hundred eighty thousand, eight hundred fifty-six".