2557166767556 has 6 divisors (see below), whose sum is σ = 4475041843230. Its totient is φ = 1278583383776.

The previous prime is 2557166767553. The next prime is 2557166767583. The reversal of 2557166767556 is 6557676617552.

It can be written as a sum of positive squares in only one way, i.e., 1358119867456 + 1199046900100 = 1165384^2 + 1095010^2 .

It is not an unprimeable number, because it can be changed into a prime (2557166767553) by changing a digit.

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 as a sum of consecutive naturals, namely, 319645845941 + ... + 319645845948.

It is an arithmetic number, because the mean of its divisors is an integer number (745840307205).

Almost surely, 2^{2557166767556} is an apocalyptic number.

It is an amenable number.

2557166767556 is a deficient number, since it is larger than the sum of its proper divisors (1917875075674).

2557166767556 is a wasteful number, since it uses less digits than its factorization.

2557166767556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639291691893 (or 639291691891 counting only the distinct ones).

The product of its digits is 555660000, while the sum is 68.

The spelling of 2557166767556 in words is "two trillion, five hundred fifty-seven billion, one hundred sixty-six million, seven hundred sixty-seven thousand, five hundred fifty-six".