11661588 has 18 divisors (see below), whose sum is σ = 29477994. Its totient is φ = 3887184.

The previous prime is 11661571. The next prime is 11661607. The reversal of 11661588 is 88516611.

11661588 is a `hidden beast` number, since 1 + 16 + 61 + 588 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9622404 + 2039184 = 3102^2 + 1428^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 323933 = 11661588 / (1 + 1 + 6 + 6 + 1 + 5 + 8 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161931 + ... + 162002.

Almost surely, 2^11661588 is an apocalyptic number.

11661588 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11661588 is an abundant number, since it is smaller than the sum of its proper divisors (17816406).

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

11661588 is a wasteful number, since it uses less digits than its factorization.

11661588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323943 (or 323938 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 11661588 is about 3414.9067337191. The cubic root of 11661588 is about 226.7701555496.

The spelling of 11661588 in words is "eleven million, six hundred sixty-one thousand, five hundred eighty-eight".