1669945064 has 8 divisors (see below), whose sum is σ = 3131147010. Its totient is φ = 834972528.

The previous prime is 1669944989. The next prime is 1669945097. The reversal of 1669945064 is 4605499661.

It can be written as a sum of positive squares in only one way, i.e., 878648164 + 791296900 = 29642^2 + 28130^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104371559 + ... + 104371574.

Almost surely, 2^1669945064 is an apocalyptic number.

It is an amenable number.

1669945064 is a deficient number, since it is larger than the sum of its proper divisors (1461201946).

1669945064 is a wasteful number, since it uses less digits than its factorization.

1669945064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208743139 (or 208743135 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 50.

The square root of 1669945064 is about 40864.9613238530. The cubic root of 1669945064 is about 1186.4079863000.

The spelling of 1669945064 in words is "one billion, six hundred sixty-nine million, nine hundred forty-five thousand, sixty-four".