1668174957 has 6 divisors (see below), whose sum is σ = 2409586062. Its totient is φ = 1112116632.

The previous prime is 1668174931. The next prime is 1668174967. The reversal of 1668174957 is 7594718661.

It can be written as a sum of positive squares in only one way, i.e., 1492585956 + 175589001 = 38634^2 + 13251^2 .

It is not a de Polignac number, because 1668174957 - 2¹⁴ = 1668158573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668174967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92676378 + ... + 92676395.

It is an arithmetic number, because the mean of its divisors is an integer number (401597677).

Almost surely, 2^1668174957 is an apocalyptic number.

It is an amenable number.

1668174957 is a deficient number, since it is larger than the sum of its proper divisors (741411105).

1668174957 is a wasteful number, since it uses less digits than its factorization.

1668174957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185352779 (or 185352776 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 1668174957 is about 40843.2975774484. The cubic root of 1668174957 is about 1185.9886488472.

The spelling of 1668174957 in words is "one billion, six hundred sixty-eight million, one hundred seventy-four thousand, nine hundred fifty-seven".