668802019 has 4 divisors (see below), whose sum is σ = 668866744. Its totient is φ = 668737296.

The previous prime is 668802011. The next prime is 668802061. The reversal of 668802019 is 910208866.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 668802019 - 2³ = 668802011 is a prime.

It is a super-2 number, since 2×668802019² = 894592281236952722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668802011) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 13002 + ... + 38815.

It is an arithmetic number, because the mean of its divisors is an integer number (167216686).

Almost surely, 2^668802019 is an apocalyptic number.

668802019 is a deficient number, since it is larger than the sum of its proper divisors (64725).

668802019 is a wasteful number, since it uses less digits than its factorization.

668802019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64724.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 668802019 is about 25861.2068357221. The cubic root of 668802019 is about 874.5121717237.

The spelling of 668802019 in words is "six hundred sixty-eight million, eight hundred two thousand, nineteen".