1669632813 has 24 divisors (see below), whose sum is σ = 2597736960. Its totient is φ = 1030344480.

The previous prime is 1669632793. The next prime is 1669632827. The reversal of 1669632813 is 3182369661.

1669632813 is a `hidden beast` number, since 1 + 6 + 6 + 9 + 632 + 8 + 1 + 3 = 666.

It is not a de Polignac number, because 1669632813 - 2⁶ = 1669632749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669632893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123678 + ... + 136511.

It is an arithmetic number, because the mean of its divisors is an integer number (108239040).

Almost surely, 2^1669632813 is an apocalyptic number.

It is an amenable number.

1669632813 is a deficient number, since it is larger than the sum of its proper divisors (928104147).

1669632813 is a wasteful number, since it uses less digits than its factorization.

1669632813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260249 (or 260246 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 1669632813 is about 40861.1406228461. The cubic root of 1669632813 is about 1186.3340357292.

The spelling of 1669632813 in words is "one billion, six hundred sixty-nine million, six hundred thirty-two thousand, eight hundred thirteen".