668143651 has 8 divisors (see below), whose sum is σ = 788225024. Its totient is φ = 554220360.

The previous prime is 668143649. The next prime is 668143661. The reversal of 668143651 is 156341866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668143651 - 2¹ = 668143649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668143601) 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 in 7 ways as a sum of consecutive naturals, for example, 1539285 + ... + 1539718.

It is an arithmetic number, because the mean of its divisors is an integer number (98528128).

Almost surely, 2^668143651 is an apocalyptic number.

668143651 is a deficient number, since it is larger than the sum of its proper divisors (120081373).

668143651 is a wasteful number, since it uses less digits than its factorization.

668143651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079041.

The product of its digits is 103680, while the sum is 40.

The square root of 668143651 is about 25848.4748292815. The cubic root of 668143651 is about 874.2251212268.

The spelling of 668143651 in words is "six hundred sixty-eight million, one hundred forty-three thousand, six hundred fifty-one".