641105645 has 4 divisors (see below), whose sum is σ = 769326780. Its totient is φ = 512884512.

The previous prime is 641105629. The next prime is 641105651. The reversal of 641105645 is 546501146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 176013289 + 465092356 = 13267^2 + 21566^2 .

It is a cyclic number.

It is not a de Polignac number, because 641105645 - 2⁴ = 641105629 is a prime.

It is a super-3 number, since 3×641105645³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64110560 + ... + 64110569.

It is an arithmetic number, because the mean of its divisors is an integer number (192331695).

Almost surely, 2^641105645 is an apocalyptic number.

It is an amenable number.

641105645 is a deficient number, since it is larger than the sum of its proper divisors (128221135).

641105645 is a wasteful number, since it uses less digits than its factorization.

641105645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128221134.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 641105645 is about 25320.0640796977. The cubic root of 641105645 is about 862.2698488344.

The spelling of 641105645 in words is "six hundred forty-one million, one hundred five thousand, six hundred forty-five".