667400666734 has 16 divisors (see below), whose sum is σ = 1030666995072. Its totient is φ = 323940222648.

The previous prime is 667400666717. The next prime is 667400666741. The reversal of 667400666734 is 437666004766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23791114 + ... + 23819149.

It is an arithmetic number, because the mean of its divisors is an integer number (64416687192).

Almost surely, 2^667400666734 is an apocalyptic number.

667400666734 is a deficient number, since it is larger than the sum of its proper divisors (363266328338).

667400666734 is a wasteful number, since it uses less digits than its factorization.

667400666734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47610471.

The product of its (nonzero) digits is 18289152, while the sum is 55.

The spelling of 667400666734 in words is "six hundred sixty-seven billion, four hundred million, six hundred sixty-six thousand, seven hundred thirty-four".