1661182388 has 12 divisors (see below), whose sum is σ = 3060072960. Its totient is φ = 786875832.

The previous prime is 1661182381. The next prime is 1661182433. The reversal of 1661182388 is 8832811661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661182381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10928756 + ... + 10928907.

It is an arithmetic number, because the mean of its divisors is an integer number (255006080).

Almost surely, 2^1661182388 is an apocalyptic number.

It is an amenable number.

1661182388 is a deficient number, since it is larger than the sum of its proper divisors (1398890572).

1661182388 is a wasteful number, since it uses less digits than its factorization.

1661182388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21857686 (or 21857684 counting only the distinct ones).

The product of its digits is 110592, while the sum is 44.

The square root of 1661182388 is about 40757.6052780337. The cubic root of 1661182388 is about 1184.3292061881.

The spelling of 1661182388 in words is "one billion, six hundred sixty-one million, one hundred eighty-two thousand, three hundred eighty-eight".