1155665616 has 80 divisors (see below), whose sum is σ = 3522060288. Its totient is φ = 319536000.

The previous prime is 1155665597. The next prime is 1155665617. The reversal of 1155665616 is 6165665511.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155665617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45060 + ... + 65891.

Almost surely, 2^1155665616 is an apocalyptic number.

1155665616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1155665616 is an abundant number, since it is smaller than the sum of its proper divisors (2366394672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155665616 is a wasteful number, since it uses less digits than its factorization.

1155665616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111000 (or 110994 counting only the distinct ones).

The product of its digits is 162000, while the sum is 42.

The square root of 1155665616 is about 33995.0822325818. The cubic root of 1155665616 is about 1049.4072591025.

The spelling of 1155665616 in words is "one billion, one hundred fifty-five million, six hundred sixty-five thousand, six hundred sixteen".