645424147 has 4 divisors (see below), whose sum is σ = 645490296. Its totient is φ = 645358000.

The previous prime is 645424139. The next prime is 645424177. The reversal of 645424147 is 741424546.

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 645424147 - 2³ = 645424139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645424177) 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, 15229 + ... + 39022.

It is an arithmetic number, because the mean of its divisors is an integer number (161372574).

Almost surely, 2^645424147 is an apocalyptic number.

645424147 is a deficient number, since it is larger than the sum of its proper divisors (66149).

645424147 is a wasteful number, since it uses less digits than its factorization.

645424147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66148.

The product of its digits is 107520, while the sum is 37.

The square root of 645424147 is about 25405.1992119723. The cubic root of 645424147 is about 864.2016075274.

The spelling of 645424147 in words is "six hundred forty-five million, four hundred twenty-four thousand, one hundred forty-seven".