1665661012 has 48 divisors (see below), whose sum is σ = 3116413440. Its totient is φ = 777151232.

The previous prime is 1665660991. The next prime is 1665661013. The reversal of 1665661012 is 2101665661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665661013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2460018 + ... + 2460694.

It is an arithmetic number, because the mean of its divisors is an integer number (64925280).

Almost surely, 2^1665661012 is an apocalyptic number.

It is an amenable number.

1665661012 is a deficient number, since it is larger than the sum of its proper divisors (1450752428).

1665661012 is a wasteful number, since it uses less digits than its factorization.

1665661012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320 (or 1318 counting only the distinct ones).

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

The square root of 1665661012 is about 40812.5104839190. The cubic root of 1665661012 is about 1185.3925864275.

The spelling of 1665661012 in words is "one billion, six hundred sixty-five million, six hundred sixty-one thousand, twelve".