668167315201 has 4 divisors (see below), whose sum is σ = 668718155092. Its totient is φ = 667616475312.

The previous prime is 668167315171. The next prime is 668167315213. The reversal of 668167315201 is 102513761866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163106938225 + 505060376976 = 403865^2 + 710676^2 .

It is a cyclic number.

It is not a de Polignac number, because 668167315201 - 2¹¹ = 668167313153 is a prime.

It is a super-2 number, since 2×668167315201² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668167310201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275418126 + ... + 275420551.

It is an arithmetic number, because the mean of its divisors is an integer number (167179538773).

Almost surely, 2^668167315201 is an apocalyptic number.

It is an amenable number.

668167315201 is a deficient number, since it is larger than the sum of its proper divisors (550839891).

668167315201 is a wasteful number, since it uses less digits than its factorization.

668167315201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550839890.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 668167315201 in words is "six hundred sixty-eight billion, one hundred sixty-seven million, three hundred fifteen thousand, two hundred one".