1165556156 has 24 divisors (see below), whose sum is σ = 2052778560. Its totient is φ = 579059712.

The previous prime is 1165556153. The next prime is 1165556191. The reversal of 1165556156 is 6516555611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165556153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550556 + ... + 552668.

It is an arithmetic number, because the mean of its divisors is an integer number (85532440).

Almost surely, 2^1165556156 is an apocalyptic number.

It is an amenable number.

1165556156 is a deficient number, since it is larger than the sum of its proper divisors (887222404).

1165556156 is a wasteful number, since it uses less digits than its factorization.

1165556156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933 (or 2931 counting only the distinct ones).

The product of its digits is 135000, while the sum is 41.

The square root of 1165556156 is about 34140.2424713124. The cubic root of 1165556156 is about 1052.3924752536.

The spelling of 1165556156 in words is "one billion, one hundred sixty-five million, five hundred fifty-six thousand, one hundred fifty-six".