664143854 has 8 divisors (see below), whose sum is σ = 1086780888. Its totient is φ = 301883560.

The previous prime is 664143797. The next prime is 664143881. The reversal of 664143854 is 458341466.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15094157 + ... + 15094200.

It is an arithmetic number, because the mean of its divisors is an integer number (135847611).

Almost surely, 2^664143854 is an apocalyptic number.

664143854 is a deficient number, since it is larger than the sum of its proper divisors (422637034).

664143854 is a wasteful number, since it uses less digits than its factorization.

664143854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30188370.

The product of its digits is 276480, while the sum is 41.

The square root of 664143854 is about 25770.9886112272. The cubic root of 664143854 is about 872.4771318818.

The spelling of 664143854 in words is "six hundred sixty-four million, one hundred forty-three thousand, eight hundred fifty-four".