668957405 has 16 divisors (see below), whose sum is σ = 808752000. Its totient is φ = 531178560.

The previous prime is 668957389. The next prime is 668957449. The reversal of 668957405 is 504759866.

It is not a de Polignac number, because 668957405 - 2⁴ = 668957389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806531 + ... + 807359.

It is an arithmetic number, because the mean of its divisors is an integer number (50547000).

Almost surely, 2^668957405 is an apocalyptic number.

It is an amenable number.

668957405 is a deficient number, since it is larger than the sum of its proper divisors (139794595).

668957405 is a wasteful number, since it uses less digits than its factorization.

668957405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 668957405 is about 25864.2108907270. The cubic root of 668957405 is about 874.5798930234.

The spelling of 668957405 in words is "six hundred sixty-eight million, nine hundred fifty-seven thousand, four hundred five".