645164174 has 24 divisors (see below), whose sum is σ = 1007908920. Its totient is φ = 309635088.

The previous prime is 645164167. The next prime is 645164203. The reversal of 645164174 is 471461546.

645164174 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645164174² = 832473622826204552, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216704 + ... + 219660.

It is an arithmetic number, because the mean of its divisors is an integer number (41996205).

Almost surely, 2^645164174 is an apocalyptic number.

645164174 is a deficient number, since it is larger than the sum of its proper divisors (362744746).

645164174 is a wasteful number, since it uses less digits than its factorization.

645164174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104 (or 3061 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 645164174 is about 25400.0821652214. The cubic root of 645164174 is about 864.0855601926.

The spelling of 645164174 in words is "six hundred forty-five million, one hundred sixty-four thousand, one hundred seventy-four".