2557780818 has 16 divisors (see below), whose sum is σ = 5240331936. Its totient is φ = 831798560.

The previous prime is 2557780801. The next prime is 2557780853. The reversal of 2557780818 is 8180877552.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5198496 + ... + 5198987.

It is an arithmetic number, because the mean of its divisors is an integer number (327520746).

Almost surely, 2^2557780818 is an apocalyptic number.

2557780818 is an abundant number, since it is smaller than the sum of its proper divisors (2682551118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2557780818 is a wasteful number, since it uses less digits than its factorization.

2557780818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397529.

The product of its (nonzero) digits is 1254400, while the sum is 51.

The square root of 2557780818 is about 50574.5075902870. The cubic root of 2557780818 is about 1367.5853568325.

The spelling of 2557780818 in words is "two billion, five hundred fifty-seven million, seven hundred eighty thousand, eight hundred eighteen".