1669669445 has 16 divisors (see below), whose sum is σ = 2054430000. Its totient is φ = 1301913600.

The previous prime is 1669669427. The next prime is 1669669451. The reversal of 1669669445 is 5449669661.

It can be written as a sum of positive squares in 8 ways, for example, as 33709636 + 1635959809 = 5806^2 + 40447^2 .

It is not a de Polignac number, because 1669669445 - 2⁸ = 1669669189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252785 + ... + 259305.

It is an arithmetic number, because the mean of its divisors is an integer number (128401875).

Almost surely, 2^1669669445 is an apocalyptic number.

It is an amenable number.

1669669445 is a deficient number, since it is larger than the sum of its proper divisors (384760555).

1669669445 is a wasteful number, since it uses less digits than its factorization.

1669669445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7816.

The product of its digits is 8398080, while the sum is 56.

The square root of 1669669445 is about 40861.5888702336. The cubic root of 1669669445 is about 1186.3427117826.

The spelling of 1669669445 in words is "one billion, six hundred sixty-nine million, six hundred sixty-nine thousand, four hundred forty-five".