641695605 has 8 divisors (see below), whose sum is σ = 1026712992. Its totient is φ = 342237648.

The previous prime is 641695603. The next prime is 641695609. The reversal of 641695605 is 506596146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 641695605 - 2¹ = 641695603 is a prime.

It is a super-3 number, since 3×641695605³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641695601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21389839 + ... + 21389868.

It is an arithmetic number, because the mean of its divisors is an integer number (128339124).

Almost surely, 2^641695605 is an apocalyptic number.

It is an amenable number.

641695605 is a deficient number, since it is larger than the sum of its proper divisors (385017387).

641695605 is a wasteful number, since it uses less digits than its factorization.

641695605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42779715.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 641695605 is about 25331.7114502751. The cubic root of 641695605 is about 862.5342611889.

The spelling of 641695605 in words is "six hundred forty-one million, six hundred ninety-five thousand, six hundred five".