660100121 has 4 divisors (see below), whose sum is σ = 661939200. Its totient is φ = 658261044.

The previous prime is 660100097. The next prime is 660100127. The reversal of 660100121 is 121001066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660100121 - 2¹⁸ = 659837977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 660100121.

It is not an unprimeable number, because it can be changed into a prime (660100127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 919001 + ... + 919718.

It is an arithmetic number, because the mean of its divisors is an integer number (165484800).

Almost surely, 2^660100121 is an apocalyptic number.

It is an amenable number.

660100121 is a deficient number, since it is larger than the sum of its proper divisors (1839079).

660100121 is a wasteful number, since it uses less digits than its factorization.

660100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839078.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 660100121 is about 25692.4136857556. The cubic root of 660100121 is about 870.7027927634.

Adding to 660100121 its reverse (121001066), we get a palindrome (781101187).

The spelling of 660100121 in words is "six hundred sixty million, one hundred thousand, one hundred twenty-one".