1166521660 has 24 divisors (see below), whose sum is σ = 2450959056. Its totient is φ = 466368000.

The previous prime is 1166521639. The next prime is 1166521669. The reversal of 1166521660 is 661256611.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166521669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27660 + ... + 55660.

It is an arithmetic number, because the mean of its divisors is an integer number (102123294).

Almost surely, 2^1166521660 is an apocalyptic number.

1166521660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1166521660 is an abundant number, since it is smaller than the sum of its proper divisors (1284437396).

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

1166521660 is a wasteful number, since it uses less digits than its factorization.

1166521660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30093 (or 30091 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1166521660 is about 34154.3798069882. The cubic root of 1166521660 is about 1052.6829828380.

The spelling of 1166521660 in words is "one billion, one hundred sixty-six million, five hundred twenty-one thousand, six hundred sixty".