646023169 has 16 divisors (see below), whose sum is σ = 736309440. Its totient is φ = 561400000.

The previous prime is 646023163. The next prime is 646023173. The reversal of 646023169 is 961320646.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 646023169 - 2¹⁷ = 645892097 is a prime.

It is a super-2 number, since 2×646023169² = 834691869769605122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646023163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22194 + ... + 42244.

It is an arithmetic number, because the mean of its divisors is an integer number (46019340).

Almost surely, 2^646023169 is an apocalyptic number.

It is an amenable number.

646023169 is a deficient number, since it is larger than the sum of its proper divisors (90286271).

646023169 is a wasteful number, since it uses less digits than its factorization.

646023169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20192.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 646023169 is about 25416.9858362474. The cubic root of 646023169 is about 864.4688817468.

The spelling of 646023169 in words is "six hundred forty-six million, twenty-three thousand, one hundred sixty-nine".