1166555520 has 384 divisors, whose sum is σ = 4506596640. Its totient is φ = 286654464.

The previous prime is 1166555491. The next prime is 1166555527. The reversal of 1166555520 is 255556611.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166555527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2021472 + ... + 2022048.

Almost surely, 2^1166555520 is an apocalyptic number.

1166555520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1166555520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2253298320).

1166555520 is an abundant number, since it is smaller than the sum of its proper divisors (3340041120).

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

1166555520 is an equidigital number, since it uses as much as digits as its factorization.

1166555520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 1166555520 is about 34154.8754938442. The cubic root of 1166555520 is about 1052.6931679613.

The spelling of 1166555520 in words is "one billion, one hundred sixty-six million, five hundred fifty-five thousand, five hundred twenty".