641753605 has 4 divisors (see below), whose sum is σ = 770104332. Its totient is φ = 513402880.

The previous prime is 641753597. The next prime is 641753639. The reversal of 641753605 is 506357146.

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 241833601 + 399920004 = 15551^2 + 19998^2 .

It is not a de Polignac number, because 641753605 - 2³ = 641753597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64175356 + ... + 64175365.

It is an arithmetic number, because the mean of its divisors is an integer number (192526083).

Almost surely, 2^641753605 is an apocalyptic number.

It is an amenable number.

641753605 is a deficient number, since it is larger than the sum of its proper divisors (128350727).

641753605 is a wasteful number, since it uses less digits than its factorization.

641753605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128350726.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 641753605 is about 25332.8562345425. The cubic root of 641753605 is about 862.5602472793.

The spelling of 641753605 in words is "six hundred forty-one million, seven hundred fifty-three thousand, six hundred five".