668126405 has 8 divisors (see below), whose sum is σ = 806671392. Its totient is φ = 531221328.

The previous prime is 668126387. The next prime is 668126411. The reversal of 668126405 is 504621866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668126405 - 2⁶ = 668126341 is a prime.

It is a Duffinian 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, 409079 + ... + 410708.

It is an arithmetic number, because the mean of its divisors is an integer number (100833924).

Almost surely, 2^668126405 is an apocalyptic number.

It is an amenable number.

668126405 is a deficient number, since it is larger than the sum of its proper divisors (138544987).

668126405 is a wasteful number, since it uses less digits than its factorization.

668126405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819955.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 668126405 is about 25848.1412291097. The cubic root of 668126405 is about 874.2175993832.

The spelling of 668126405 in words is "six hundred sixty-eight million, one hundred twenty-six thousand, four hundred five".