6557557556 has 12 divisors (see below), whose sum is σ = 12518973600. Its totient is φ = 2980707960.

The previous prime is 6557557549. The next prime is 6557557621.

It is a happy number.

6557557556 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6557557556² = 86003122200505386272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74517656 + ... + 74517743.

It is an arithmetic number, because the mean of its divisors is an integer number (1043247800).

Almost surely, 2^6557557556 is an apocalyptic number.

It is an amenable number.

6557557556 is a deficient number, since it is larger than the sum of its proper divisors (5961416044).

6557557556 is a wasteful number, since it uses less digits than its factorization.

6557557556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149035414 (or 149035412 counting only the distinct ones).

The product of its digits is 27562500, while the sum is 56.

The square root of 6557557556 is about 80978.7475576154. The cubic root of 6557557556 is about 1871.7479681914.

The spelling of 6557557556 in words is "six billion, five hundred fifty-seven million, five hundred fifty-seven thousand, five hundred fifty-six".