1671705556 has 6 divisors (see below), whose sum is σ = 2925484730. Its totient is φ = 835852776.

The previous prime is 1671705521. The next prime is 1671705559. The reversal of 1671705556 is 6555071761.

It can be written as a sum of positive squares in only one way, i.e., 1657792656 + 13912900 = 40716^2 + 3730^2 .

It is a super-2 number, since 2×1671705556² = 5589198931922538272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671705559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208963191 + ... + 208963198.

Almost surely, 2^1671705556 is an apocalyptic number.

It is an amenable number.

1671705556 is a deficient number, since it is larger than the sum of its proper divisors (1253779174).

1671705556 is a wasteful number, since it uses less digits than its factorization.

1671705556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417926393 (or 417926391 counting only the distinct ones).

The product of its (nonzero) digits is 220500, while the sum is 43.

The square root of 1671705556 is about 40886.4960102966. The cubic root of 1671705556 is about 1186.8247521511.

The spelling of 1671705556 in words is "one billion, six hundred seventy-one million, seven hundred five thousand, five hundred fifty-six".