667420404754 has 4 divisors (see below), whose sum is σ = 1001130607134. Its totient is φ = 333710202376.

The previous prime is 667420404733. The next prime is 667420404767. The reversal of 667420404754 is 457404024766.

It is a happy number.

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., 543426980625 + 123993424129 = 737175^2 + 352127^2 .

It is a junction number, because it is equal to n+sod(n) for n = 667420404698 and 667420404707.

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, 166855101187 + ... + 166855101190.

Almost surely, 2^667420404754 is an apocalyptic number.

667420404754 is a deficient number, since it is larger than the sum of its proper divisors (333710202380).

667420404754 is a wasteful number, since it uses less digits than its factorization.

667420404754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333710202379.

The product of its (nonzero) digits is 4515840, while the sum is 49.

The spelling of 667420404754 in words is "six hundred sixty-seven billion, four hundred twenty million, four hundred four thousand, seven hundred fifty-four".