664118243 has 6 divisors (see below), whose sum is σ = 705482316. Its totient is φ = 625052192.

The previous prime is 664118233. The next prime is 664118251. The reversal of 664118243 is 342811466.

It is not a de Polignac number, because 664118243 - 2⁴ = 664118227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664118233) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1148705 + ... + 1149282.

It is an arithmetic number, because the mean of its divisors is an integer number (117580386).

Almost surely, 2^664118243 is an apocalyptic number.

664118243 is a deficient number, since it is larger than the sum of its proper divisors (41364073).

664118243 is a wasteful number, since it uses less digits than its factorization.

664118243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298021 (or 2298004 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 664118243 is about 25770.4917104816. The cubic root of 664118243 is about 872.4659167919.

The spelling of 664118243 in words is "six hundred sixty-four million, one hundred eighteen thousand, two hundred forty-three".