1165555017220 has 48 divisors (see below), whose sum is σ = 2673635283648. Its totient is φ = 423289823360.

The previous prime is 1165555017203. The next prime is 1165555017281. The reversal of 1165555017220 is 227105555611.

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 15 ways as a sum of consecutive naturals, for example, 3256834 + ... + 3596953.

It is an arithmetic number, because the mean of its divisors is an integer number (55700735076).

Almost surely, 2^{1165555017220} is an apocalyptic number.

1165555017220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165555017220 is an abundant number, since it is smaller than the sum of its proper divisors (1508080266428).

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

1165555017220 is a wasteful number, since it uses less digits than its factorization.

1165555017220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6854580 (or 6854578 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 40.

The spelling of 1165555017220 in words is "one trillion, one hundred sixty-five billion, five hundred fifty-five million, seventeen thousand, two hundred twenty".