667420437874 has 4 divisors (see below), whose sum is σ = 1001130656814. Its totient is φ = 333710218936.

The previous prime is 667420437857. The next prime is 667420437883. The reversal of 667420437874 is 478734024766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 434667259849 + 232753178025 = 659293^2 + 482445^2 .

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, 166855109467 + ... + 166855109470.

Almost surely, 2^667420437874 is an apocalyptic number.

667420437874 is a deficient number, since it is larger than the sum of its proper divisors (333710218940).

667420437874 is a wasteful number, since it uses less digits than its factorization.

667420437874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333710218939.

The product of its (nonzero) digits is 37933056, while the sum is 58.

The spelling of 667420437874 in words is "six hundred sixty-seven billion, four hundred twenty million, four hundred thirty-seven thousand, eight hundred seventy-four".