668206331 has 8 divisors (see below), whose sum is σ = 720486480. Its totient is φ = 616051872.

The previous prime is 668206321. The next prime is 668206339. The reversal of 668206331 is 133602866.

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 668206331 - 2¹⁸ = 667944187 is a prime.

It is a super-2 number, since 2×668206331² = 892999401576963122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668206291 and 668206300.

It is not an unprimeable number, because it can be changed into a prime (668206339) 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, 20225 + ... + 41778.

It is an arithmetic number, because the mean of its divisors is an integer number (90060810).

Almost surely, 2^668206331 is an apocalyptic number.

668206331 is a deficient number, since it is larger than the sum of its proper divisors (52280149).

668206331 is a wasteful number, since it uses less digits than its factorization.

668206331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62845.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 668206331 is about 25849.6872514930. The cubic root of 668206331 is about 874.2524580214.

The spelling of 668206331 in words is "six hundred sixty-eight million, two hundred six thousand, three hundred thirty-one".