660408225181 has 2 divisors, whose sum is σ = 660408225182. Its totient is φ = 660408225180.

The previous prime is 660408225161. The next prime is 660408225283. The reversal of 660408225181 is 181522804066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644624323225 + 15783901956 = 802885^2 + 125634^2 .

It is a cyclic number.

It is not a de Polignac number, because 660408225181 - 2⁷ = 660408225053 is a prime.

It is a super-2 number, since 2×660408225181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660408225121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330204112590 + 330204112591.

It is an arithmetic number, because the mean of its divisors is an integer number (330204112591).

Almost surely, 2^660408225181 is an apocalyptic number.

It is an amenable number.

660408225181 is a deficient number, since it is larger than the sum of its proper divisors (1).

660408225181 is an equidigital number, since it uses as much as digits as its factorization.

660408225181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 660408225181 in words is "six hundred sixty billion, four hundred eight million, two hundred twenty-five thousand, one hundred eighty-one".