667420686874 has 4 divisors (see below), whose sum is σ = 1001131030314. Its totient is φ = 333710343436.

The previous prime is 667420686839. The next prime is 667420686917. The reversal of 667420686874 is 478686024766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 478686024766 = 2 ⋅239343012383.

It can be written as a sum of positive squares in only one way, i.e., 646887229849 + 20533457025 = 804293^2 + 143295^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166855171717 + ... + 166855171720.

Almost surely, 2^667420686874 is an apocalyptic number.

667420686874 is a deficient number, since it is larger than the sum of its proper divisors (333710343440).

667420686874 is a wasteful number, since it uses less digits than its factorization.

667420686874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333710343439.

The product of its (nonzero) digits is 130056192, while the sum is 64.

The spelling of 667420686874 in words is "six hundred sixty-seven billion, four hundred twenty million, six hundred eighty-six thousand, eight hundred seventy-four".