660075121 has 2 divisors, whose sum is σ = 660075122. Its totient is φ = 660075120.

The previous prime is 660075107. The next prime is 660075127. The reversal of 660075121 is 121570066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353440000 + 306635121 = 18800^2 + 17511^2 .

It is a cyclic number.

It is not a de Polignac number, because 660075121 - 2⁷ = 660074993 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660075121.

It is not a weakly prime, because it can be changed into another prime (660075127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330037560 + 330037561.

It is an arithmetic number, because the mean of its divisors is an integer number (330037561).

Almost surely, 2^660075121 is an apocalyptic number.

It is an amenable number.

660075121 is a deficient number, since it is larger than the sum of its proper divisors (1).

660075121 is an equidigital number, since it uses as much as digits as its factorization.

660075121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 660075121 is about 25691.9271562100. The cubic root of 660075121 is about 870.6918005699.

The spelling of 660075121 in words is "six hundred sixty million, seventy-five thousand, one hundred twenty-one".