1669686012 has 36 divisors (see below), whose sum is σ = 4404101520. Its totient is φ = 532363392.

The previous prime is 1669685921. The next prime is 1669686019. The reversal of 1669686012 is 2106869661.

1669686012 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669686019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1007437 + ... + 1009092.

Almost surely, 2^1669686012 is an apocalyptic number.

1669686012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1669686012 is an abundant number, since it is smaller than the sum of its proper divisors (2734415508).

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

1669686012 is a wasteful number, since it uses less digits than its factorization.

1669686012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016562 (or 2016557 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1669686012 is about 40861.7915906780. The cubic root of 1669686012 is about 1186.3466355283.

The spelling of 1669686012 in words is "one billion, six hundred sixty-nine million, six hundred eighty-six thousand, twelve".