668432193 has 64 divisors (see below), whose sum is σ = 1075630080. Its totient is φ = 366949440.

The previous prime is 668432183. The next prime is 668432201. The reversal of 668432193 is 391234866.

It is not a de Polignac number, because 668432193 - 2⁸ = 668431937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668432123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4100730 + ... + 4100892.

It is an arithmetic number, because the mean of its divisors is an integer number (16806720).

Almost surely, 2^668432193 is an apocalyptic number.

It is an amenable number.

668432193 is a deficient number, since it is larger than the sum of its proper divisors (407197887).

668432193 is a wasteful number, since it uses less digits than its factorization.

668432193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 269 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 668432193 is about 25854.0556392996. The cubic root of 668432193 is about 874.3509496377.

The spelling of 668432193 in words is "six hundred sixty-eight million, four hundred thirty-two thousand, one hundred ninety-three".