1115566660 has 24 divisors (see below), whose sum is σ = 2522897496. Its totient is φ = 411901440.

The previous prime is 1115566637. The next prime is 1115566679. The reversal of 1115566660 is 666655111.

It can be written as a sum of positive squares in 4 ways, for example, as 256256064 + 859310596 = 16008^2 + 29314^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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 in 7 ways as a sum of consecutive naturals, for example, 2145061 + ... + 2145580.

It is an arithmetic number, because the mean of its divisors is an integer number (105120729).

Almost surely, 2^1115566660 is an apocalyptic number.

1115566660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1115566660 is an abundant number, since it is smaller than the sum of its proper divisors (1407330836).

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

1115566660 is a wasteful number, since it uses less digits than its factorization.

1115566660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290663 (or 4290661 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1115566660 is about 33400.0997004500. The cubic root of 1115566660 is about 1037.1267648613.

It can be divided in two parts, 11155666 and 60, that added together give a triangular number (11155726 = T₄₇₂₃).

The spelling of 1115566660 in words is "one billion, one hundred fifteen million, five hundred sixty-six thousand, six hundred sixty".