668497822 has 4 divisors (see below), whose sum is σ = 1002746736. Its totient is φ = 334248910.

The previous prime is 668497807. The next prime is 668497831. The reversal of 668497822 is 228794866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 228794866 = 2 ⋅114397433.

It is a self number, because there is not a number n which added to its sum of digits gives 668497822.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167124454 + ... + 167124457.

It is an arithmetic number, because the mean of its divisors is an integer number (250686684).

Almost surely, 2^668497822 is an apocalyptic number.

668497822 is a deficient number, since it is larger than the sum of its proper divisors (334248914).

668497822 is a wasteful number, since it uses less digits than its factorization.

668497822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334248913.

The product of its digits is 2322432, while the sum is 52.

The square root of 668497822 is about 25855.3248287466. The cubic root of 668497822 is about 874.3795643081.

The spelling of 668497822 in words is "six hundred sixty-eight million, four hundred ninety-seven thousand, eight hundred twenty-two".