1155555656 has 8 divisors (see below), whose sum is σ = 2166666870. Its totient is φ = 577777824.

The previous prime is 1155555649. The next prime is 1155555683. The reversal of 1155555656 is 6565555511.

It can be written as a sum of positive squares in only one way, i.e., 1060804900 + 94750756 = 32570^2 + 9734^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1155555656² = 2670617748227180672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72222221 + ... + 72222236.

Almost surely, 2^1155555656 is an apocalyptic number.

It is an amenable number.

1155555656 is a deficient number, since it is larger than the sum of its proper divisors (1011111214).

1155555656 is a wasteful number, since it uses less digits than its factorization.

1155555656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144444463 (or 144444459 counting only the distinct ones).

The product of its digits is 562500, while the sum is 44.

The square root of 1155555656 is about 33993.4649013601. The cubic root of 1155555656 is about 1049.3739748259.

The spelling of 1155555656 in words is "one billion, one hundred fifty-five million, five hundred fifty-five thousand, six hundred fifty-six".