1115115566 has 4 divisors (see below), whose sum is σ = 1672673352. Its totient is φ = 557557782.

The previous prime is 1115115503. The next prime is 1115115571. The reversal of 1115115566 is 6655115111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6655115111 = 647 ⋅10286113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278778890 + ... + 278778893.

It is an arithmetic number, because the mean of its divisors is an integer number (418168338).

Almost surely, 2^1115115566 is an apocalyptic number.

1115115566 is a deficient number, since it is larger than the sum of its proper divisors (557557786).

1115115566 is an equidigital number, since it uses as much as digits as its factorization.

1115115566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557557785.

The product of its digits is 4500, while the sum is 32.

The square root of 1115115566 is about 33393.3461336237. The cubic root of 1115115566 is about 1036.9869540814.

The spelling of 1115115566 in words is "one billion, one hundred fifteen million, one hundred fifteen thousand, five hundred sixty-six".