1669639966 has 32 divisors (see below), whose sum is σ = 2682808128. Its totient is φ = 777384960.

The previous prime is 1669639963. The next prime is 1669639987. The reversal of 1669639966 is 6699369661.

It is a super-3 number, since 3×1669639966³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669639963) 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, 1615786 + ... + 1616818.

It is an arithmetic number, because the mean of its divisors is an integer number (83837754).

Almost surely, 2^1669639966 is an apocalyptic number.

1669639966 is a deficient number, since it is larger than the sum of its proper divisors (1013168162).

1669639966 is a wasteful number, since it uses less digits than its factorization.

1669639966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956.

The product of its digits is 17006112, while the sum is 61.

The square root of 1669639966 is about 40861.2281509012. The cubic root of 1669639966 is about 1186.3357298812.

The spelling of 1669639966 in words is "one billion, six hundred sixty-nine million, six hundred thirty-nine thousand, nine hundred sixty-six".