1161655780 has 12 divisors (see below), whose sum is σ = 2439477180. Its totient is φ = 464662304.

The previous prime is 1161655769. The next prime is 1161655889. The reversal of 1161655780 is 875561611.

It can be written as a sum of positive squares in 2 ways, for example, as 832668736 + 328987044 = 28856^2 + 18138^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29041375 + ... + 29041414.

It is an arithmetic number, because the mean of its divisors is an integer number (203289765).

Almost surely, 2^1161655780 is an apocalyptic number.

1161655780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161655780 is an abundant number, since it is smaller than the sum of its proper divisors (1277821400).

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

1161655780 is a wasteful number, since it uses less digits than its factorization.

1161655780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58082798 (or 58082796 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 1161655780 is about 34083.0717512374. The cubic root of 1161655780 is about 1051.2172670350.

The spelling of 1161655780 in words is "one billion, one hundred sixty-one million, six hundred fifty-five thousand, seven hundred eighty".