2557166767557 has 4 divisors (see below), whose sum is σ = 3409555690080. Its totient is φ = 1704777845036.

The previous prime is 2557166767553. The next prime is 2557166767583. The reversal of 2557166767557 is 7557676617552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2557166767557 - 2² = 2557166767553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2557166767491 and 2557166767500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557166767553) 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, 426194461257 + ... + 426194461262.

It is an arithmetic number, because the mean of its divisors is an integer number (852388922520).

Almost surely, 2^{2557166767557} is an apocalyptic number.

It is an amenable number.

2557166767557 is a deficient number, since it is larger than the sum of its proper divisors (852388922523).

2557166767557 is an equidigital number, since it uses as much as digits as its factorization.

2557166767557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852388922522.

The product of its digits is 648270000, while the sum is 69.

The spelling of 2557166767557 in words is "two trillion, five hundred fifty-seven billion, one hundred sixty-six million, seven hundred sixty-seven thousand, five hundred fifty-seven".