668025131 has 2 divisors, whose sum is σ = 668025132. Its totient is φ = 668025130.

The previous prime is 668025101. The next prime is 668025157. The reversal of 668025131 is 131520866.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668025131 - 2⁶ = 668025067 is a prime.

It is a super-3 number, since 3×668025131³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668025101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334012565 + 334012566.

It is an arithmetic number, because the mean of its divisors is an integer number (334012566).

Almost surely, 2^668025131 is an apocalyptic number.

668025131 is a deficient number, since it is larger than the sum of its proper divisors (1).

668025131 is an equidigital number, since it uses as much as digits as its factorization.

668025131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 668025131 is about 25846.1821358591. The cubic root of 668025131 is about 874.1734261119.

Adding to 668025131 its reverse (131520866), we get a palindrome (799545997).

The spelling of 668025131 in words is "six hundred sixty-eight million, twenty-five thousand, one hundred thirty-one".