1668956953 has 2 divisors, whose sum is σ = 1668956954. Its totient is φ = 1668956952.

The previous prime is 1668956881. The next prime is 1668956959. The reversal of 1668956953 is 3596598661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1065173769 + 603783184 = 32637^2 + 24572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668956953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668956959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834478476 + 834478477.

It is an arithmetic number, because the mean of its divisors is an integer number (834478477).

Almost surely, 2^1668956953 is an apocalyptic number.

It is an amenable number.

1668956953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668956953 is an equidigital number, since it uses as much as digits as its factorization.

1668956953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10497600, while the sum is 58.

The square root of 1668956953 is about 40852.8695809731. The cubic root of 1668956953 is about 1186.1739398631.

The spelling of 1668956953 in words is "one billion, six hundred sixty-eight million, nine hundred fifty-six thousand, nine hundred fifty-three".