664156123 has 8 divisors (see below), whose sum is σ = 672634368. Its totient is φ = 655689384.

The previous prime is 664156111. The next prime is 664156127. The reversal of 664156123 is 321651466.

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

It is a cyclic number.

It is not a de Polignac number, because 664156123 - 2²⁵ = 630601691 is a prime.

It is a super-2 number, since 2×664156123² = 882206711436782258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664156127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218190 + ... + 221212.

It is an arithmetic number, because the mean of its divisors is an integer number (84079296).

Almost surely, 2^664156123 is an apocalyptic number.

664156123 is a deficient number, since it is larger than the sum of its proper divisors (8478245).

664156123 is a wasteful number, since it uses less digits than its factorization.

664156123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753.

The product of its digits is 25920, while the sum is 34.

The square root of 664156123 is about 25771.2266491139. The cubic root of 664156123 is about 872.4825043905.

The spelling of 664156123 in words is "six hundred sixty-four million, one hundred fifty-six thousand, one hundred twenty-three".