668521383 has 8 divisors (see below), whose sum is σ = 908180208. Its totient is φ = 437271744.

The previous prime is 668521361. The next prime is 668521393. The reversal of 668521383 is 383125866.

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

It is not a de Polignac number, because 668521383 - 2⁶ = 668521319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668521393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2102110 + ... + 2102427.

It is an arithmetic number, because the mean of its divisors is an integer number (113522526).

Almost surely, 2^668521383 is an apocalyptic number.

668521383 is a deficient number, since it is larger than the sum of its proper divisors (239658825).

668521383 is a wasteful number, since it uses less digits than its factorization.

668521383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4204593.

The product of its digits is 207360, while the sum is 42.

The square root of 668521383 is about 25855.7804562152. The cubic root of 668521383 is about 874.3898366003.

The spelling of 668521383 in words is "six hundred sixty-eight million, five hundred twenty-one thousand, three hundred eighty-three".