645567141 has 4 divisors (see below), whose sum is σ = 860756192. Its totient is φ = 430378092.

The previous prime is 645567133. The next prime is 645567187. The reversal of 645567141 is 141765546.

645567141 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 645567141 - 2³ = 645567133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645567141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645567101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107594521 + ... + 107594526.

It is an arithmetic number, because the mean of its divisors is an integer number (215189048).

Almost surely, 2^645567141 is an apocalyptic number.

It is an amenable number.

645567141 is a deficient number, since it is larger than the sum of its proper divisors (215189051).

645567141 is a wasteful number, since it uses less digits than its factorization.

645567141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215189050.

The product of its digits is 100800, while the sum is 39.

The square root of 645567141 is about 25408.0133225721. The cubic root of 645567141 is about 864.2654242286.

The spelling of 645567141 in words is "six hundred forty-five million, five hundred sixty-seven thousand, one hundred forty-one".