1665646148 has 12 divisors (see below), whose sum is σ = 2937833472. Its totient is φ = 826265160.

The previous prime is 1665646139. The next prime is 1665646159. The reversal of 1665646148 is 8416465661.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638908 + ... + 1639923.

It is an arithmetic number, because the mean of its divisors is an integer number (244819456).

Almost surely, 2^1665646148 is an apocalyptic number.

It is an amenable number.

1665646148 is a deficient number, since it is larger than the sum of its proper divisors (1272187324).

1665646148 is a wasteful number, since it uses less digits than its factorization.

1665646148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278962 (or 3278960 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The square root of 1665646148 is about 40812.3283824876. The cubic root of 1665646148 is about 1185.3890603543.

The spelling of 1665646148 in words is "one billion, six hundred sixty-five million, six hundred forty-six thousand, one hundred forty-eight".