668469413 has 2 divisors, whose sum is σ = 668469414. Its totient is φ = 668469412.

The previous prime is 668469407. The next prime is 668469421. The reversal of 668469413 is 314964866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535367044 + 133102369 = 23138^2 + 11537^2 .

It is a cyclic number.

It is not a de Polignac number, because 668469413 - 2⁴ = 668469397 is a prime.

It is a super-2 number, since 2×668469413² = 893702712233129138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668469463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334234706 + 334234707.

It is an arithmetic number, because the mean of its divisors is an integer number (334234707).

Almost surely, 2^668469413 is an apocalyptic number.

It is an amenable number.

668469413 is a deficient number, since it is larger than the sum of its proper divisors (1).

668469413 is an equidigital number, since it uses as much as digits as its factorization.

668469413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 47.

The square root of 668469413 is about 25854.7754389784. The cubic root of 668469413 is about 874.3671780294.

The spelling of 668469413 in words is "six hundred sixty-eight million, four hundred sixty-nine thousand, four hundred thirteen".