1156665656 has 8 divisors (see below), whose sum is σ = 2168748120. Its totient is φ = 578332824.

The previous prime is 1156665619. The next prime is 1156665661. The reversal of 1156665656 is 6565666511.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1156665656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72291596 + ... + 72291611.

It is an arithmetic number, because the mean of its divisors is an integer number (271093515).

Almost surely, 2^1156665656 is an apocalyptic number.

It is an amenable number.

1156665656 is a deficient number, since it is larger than the sum of its proper divisors (1012082464).

1156665656 is a wasteful number, since it uses less digits than its factorization.

1156665656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144583213 (or 144583209 counting only the distinct ones).

The product of its digits is 972000, while the sum is 47.

The square root of 1156665656 is about 34009.7876500280. The cubic root of 1156665656 is about 1049.7098687436.

The spelling of 1156665656 in words is "one billion, one hundred fifty-six million, six hundred sixty-five thousand, six hundred fifty-six".