2556420818 has 64 divisors (see below), whose sum is σ = 4655059200. Its totient is φ = 1029853440.

The previous prime is 2556420793. The next prime is 2556420857. The reversal of 2556420818 is 8180246552.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2699021 + ... + 2699967.

It is an arithmetic number, because the mean of its divisors is an integer number (72735300).

Almost surely, 2^2556420818 is an apocalyptic number.

2556420818 is a deficient number, since it is larger than the sum of its proper divisors (2098638382).

2556420818 is a wasteful number, since it uses less digits than its factorization.

2556420818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155.

The product of its (nonzero) digits is 153600, while the sum is 41.

The square root of 2556420818 is about 50561.0602934709. The cubic root of 2556420818 is about 1367.3429271691.

The spelling of 2556420818 in words is "two billion, five hundred fifty-six million, four hundred twenty thousand, eight hundred eighteen".