645455169 has 32 divisors (see below), whose sum is σ = 989815680. Its totient is φ = 415411200.

The previous prime is 645455159. The next prime is 645455171. The reversal of 645455169 is 961554546.

645455169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645455169 - 2¹² = 645451073 is a prime.

It is a super-2 number, since 2×645455169² = 833224750377637122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645455159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104374 + ... + 110384.

It is an arithmetic number, because the mean of its divisors is an integer number (30931740).

Almost surely, 2^645455169 is an apocalyptic number.

It is an amenable number.

645455169 is a deficient number, since it is larger than the sum of its proper divisors (344360511).

645455169 is a wasteful number, since it uses less digits than its factorization.

645455169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6158 (or 6152 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 645455169 is about 25405.8097489531. The cubic root of 645455169 is about 864.2154531166.

The spelling of 645455169 in words is "six hundred forty-five million, four hundred fifty-five thousand, one hundred sixty-nine".