660666131 has 2 divisors, whose sum is σ = 660666132. Its totient is φ = 660666130.

The previous prime is 660666103. The next prime is 660666161. The reversal of 660666131 is 131666066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660666131 - 2¹⁴ = 660649747 is a prime.

It is a super-2 number, since 2×660666131² = 872959473301018322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 660666091 and 660666100.

It is not a weakly prime, because it can be changed into another prime (660666101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330333065 + 330333066.

It is an arithmetic number, because the mean of its divisors is an integer number (330333066).

Almost surely, 2^660666131 is an apocalyptic number.

660666131 is a deficient number, since it is larger than the sum of its proper divisors (1).

660666131 is an equidigital number, since it uses as much as digits as its factorization.

660666131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 660666131 is about 25703.4264447369. The cubic root of 660666131 is about 870.9515861809.

The spelling of 660666131 in words is "six hundred sixty million, six hundred sixty-six thousand, one hundred thirty-one".