645233161 has 8 divisors (see below), whose sum is σ = 657725184. Its totient is φ = 632835840.

The previous prime is 645233159. The next prime is 645233177. The reversal of 645233161 is 161332546.

645233161 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 a cyclic number.

It is not a de Polignac number, because 645233161 - 2¹ = 645233159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645233111) 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, 9841 + ... + 37246.

It is an arithmetic number, because the mean of its divisors is an integer number (82215648).

Almost surely, 2^645233161 is an apocalyptic number.

It is an amenable number.

645233161 is a deficient number, since it is larger than the sum of its proper divisors (12492023).

645233161 is a wasteful number, since it uses less digits than its factorization.

645233161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47351.

The product of its digits is 12960, while the sum is 31.

The square root of 645233161 is about 25401.4401363387. The cubic root of 645233161 is about 864.1163578036.

The spelling of 645233161 in words is "six hundred forty-five million, two hundred thirty-three thousand, one hundred sixty-one".