1665646149 has 8 divisors (see below), whose sum is σ = 2221050112. Its totient is φ = 1110336480.

The previous prime is 1665646139. The next prime is 1665646159. The reversal of 1665646149 is 9416465661.

It is an interprime number because it is at equal distance from previous prime (1665646139) and next prime (1665646159).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1665646149 - 2⁴ = 1665646133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665646098 and 1665646107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665646109) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 56652 + ... + 80874.

It is an arithmetic number, because the mean of its divisors is an integer number (277631264).

Almost surely, 2^1665646149 is an apocalyptic number.

It is an amenable number.

1665646149 is a deficient number, since it is larger than the sum of its proper divisors (555403963).

1665646149 is a wasteful number, since it uses less digits than its factorization.

1665646149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47147.

The product of its digits is 933120, while the sum is 48.

The square root of 1665646149 is about 40812.3283947388. The cubic root of 1665646149 is about 1185.3890605915.

The spelling of 1665646149 in words is "one billion, six hundred sixty-five million, six hundred forty-six thousand, one hundred forty-nine".