2557805678 has 4 divisors (see below), whose sum is σ = 3836708520. Its totient is φ = 1278902838.

The previous prime is 2557805651. The next prime is 2557805681. The reversal of 2557805678 is 8765087552.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639451418 + ... + 639451421.

It is an arithmetic number, because the mean of its divisors is an integer number (959177130).

Almost surely, 2^2557805678 is an apocalyptic number.

2557805678 is a deficient number, since it is larger than the sum of its proper divisors (1278902842).

2557805678 is a wasteful number, since it uses less digits than its factorization.

2557805678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278902841.

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

The square root of 2557805678 is about 50574.7533656863. The cubic root of 2557805678 is about 1367.5897875043.

The spelling of 2557805678 in words is "two billion, five hundred fifty-seven million, eight hundred five thousand, six hundred seventy-eight".