7551556551557 has 4 divisors (see below), whose sum is σ = 7552233893100. Its totient is φ = 7550879210016.

The previous prime is 7551556551527. The next prime is 7551556551647.

7551556551557 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5380548799201 + 2171007752356 = 2319601^2 + 1473434^2 .

It is a cyclic number.

It is not a de Polignac number, because 7551556551557 - 2¹⁶ = 7551556486021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7551556551557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7551556551527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338654048 + ... + 338676345.

It is an arithmetic number, because the mean of its divisors is an integer number (1888058473275).

Almost surely, 2^{7551556551557} is an apocalyptic number.

It is an amenable number.

7551556551557 is a deficient number, since it is larger than the sum of its proper divisors (677341543).

7551556551557 is a wasteful number, since it uses less digits than its factorization.

7551556551557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677341542.

The product of its digits is 114843750, while the sum is 62.

The spelling of 7551556551557 in words is "seven trillion, five hundred fifty-one billion, five hundred fifty-six million, five hundred fifty-one thousand, five hundred fifty-seven".