664751121 has 8 divisors (see below), whose sum is σ = 886512000. Its totient is φ = 443078832.

The previous prime is 664751117. The next prime is 664751123. The reversal of 664751121 is 121157466.

664751121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664751121 - 2² = 664751117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664751123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2025 + ... + 36518.

It is an arithmetic number, because the mean of its divisors is an integer number (110814000).

Almost surely, 2^664751121 is an apocalyptic number.

It is an amenable number.

664751121 is a deficient number, since it is larger than the sum of its proper divisors (221760879).

664751121 is a wasteful number, since it uses less digits than its factorization.

664751121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44295.

The product of its digits is 10080, while the sum is 33.

The square root of 664751121 is about 25782.7679080428. The cubic root of 664751121 is about 872.7429704573.

The spelling of 664751121 in words is "six hundred sixty-four million, seven hundred fifty-one thousand, one hundred twenty-one".