645464167 has 4 divisors (see below), whose sum is σ = 645522696. Its totient is φ = 645405640.

The previous prime is 645464159. The next prime is 645464179. The reversal of 645464167 is 761464546.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 645464167 - 2³ = 645464159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645464867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7153 + ... + 36634.

It is an arithmetic number, because the mean of its divisors is an integer number (161380674).

Almost surely, 2^645464167 is an apocalyptic number.

645464167 is a deficient number, since it is larger than the sum of its proper divisors (58529).

645464167 is a wasteful number, since it uses less digits than its factorization.

645464167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58528.

The product of its digits is 483840, while the sum is 43.

The square root of 645464167 is about 25405.9868338154. The cubic root of 645464167 is about 864.2194689775.

The spelling of 645464167 in words is "six hundred forty-five million, four hundred sixty-four thousand, one hundred sixty-seven".