660429121 has 4 divisors (see below), whose sum is σ = 720468144. Its totient is φ = 600390100.

The previous prime is 660429109. The next prime is 660429137. The reversal of 660429121 is 121924066.

660429121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 660429121 - 2⁹ = 660428609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660429191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30019495 + ... + 30019516.

It is an arithmetic number, because the mean of its divisors is an integer number (180117036).

Almost surely, 2^660429121 is an apocalyptic number.

It is an amenable number.

660429121 is a deficient number, since it is larger than the sum of its proper divisors (60039023).

660429121 is a wasteful number, since it uses less digits than its factorization.

660429121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60039022.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 660429121 is about 25698.8155563637. The cubic root of 660429121 is about 870.8474241767.

The spelling of 660429121 in words is "six hundred sixty million, four hundred twenty-nine thousand, one hundred twenty-one".