667421057834 has 4 divisors (see below), whose sum is σ = 1001131586754. Its totient is φ = 333710528916.

The previous prime is 667421057783. The next prime is 667421057869. The reversal of 667421057834 is 438750124766.

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., 379967452225 + 287453605609 = 616415^2 + 536147^2 .

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, 166855264457 + ... + 166855264460.

Almost surely, 2^667421057834 is an apocalyptic number.

667421057834 is a deficient number, since it is larger than the sum of its proper divisors (333710528920).

667421057834 is a wasteful number, since it uses less digits than its factorization.

667421057834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333710528919.

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 667421057834 in words is "six hundred sixty-seven billion, four hundred twenty-one million, fifty-seven thousand, eight hundred thirty-four".