1668957957 has 24 divisors (see below), whose sum is σ = 2458341600. Its totient is φ = 1090762848.

The previous prime is 1668957923. The next prime is 1668957971. The reversal of 1668957957 is 7597598661.

1668957957 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 9 + 579 + 57 = 666.

It is not a de Polignac number, because 1668957957 - 2⁶ = 1668957893 is a prime.

It is a super-2 number, since 2×1668957957² = 5570841324467227698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1668957894 and 1668957903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668957457) 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, 197103 + ... + 205395.

It is an arithmetic number, because the mean of its divisors is an integer number (102430900).

Almost surely, 2^1668957957 is an apocalyptic number.

It is an amenable number.

1668957957 is a deficient number, since it is larger than the sum of its proper divisors (789383643).

1668957957 is a wasteful number, since it uses less digits than its factorization.

1668957957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8737 (or 8734 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 63.

The square root of 1668957957 is about 40852.8818689698. The cubic root of 1668957957 is about 1186.1741777200.

The spelling of 1668957957 in words is "one billion, six hundred sixty-eight million, nine hundred fifty-seven thousand, nine hundred fifty-seven".