2557944771842 has 8 divisors (see below), whose sum is σ = 3836937951756. Its totient is φ = 1278965454592.

The previous prime is 2557944771841. The next prime is 2557944771881. The reversal of 2557944771842 is 2481774497552.

It can be written as a sum of positive squares in 2 ways, for example, as 2454896709721 + 103048062121 = 1566811^2 + 321011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2557944771841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2991383 + ... + 3750234.

Almost surely, 2^{2557944771842} is an apocalyptic number.

2557944771842 is a deficient number, since it is larger than the sum of its proper divisors (1278993179914).

2557944771842 is a wasteful number, since it uses less digits than its factorization.

2557944771842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6931332.

The product of its digits is 158054400, while the sum is 65.

The spelling of 2557944771842 in words is "two trillion, five hundred fifty-seven billion, nine hundred forty-four million, seven hundred seventy-one thousand, eight hundred forty-two".