641632655 has 8 divisors (see below), whose sum is σ = 771297072. Its totient is φ = 512414208.

The previous prime is 641632601. The next prime is 641632687. The reversal of 641632655 is 556236146.

It is a happy number.

641632655 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 641632655 - 2¹⁰ = 641631631 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 7 ways as a sum of consecutive naturals, for example, 108317 + ... + 114086.

It is an arithmetic number, because the mean of its divisors is an integer number (96412134).

Almost surely, 2^641632655 is an apocalyptic number.

641632655 is a deficient number, since it is larger than the sum of its proper divisors (129664417).

641632655 is a wasteful number, since it uses less digits than its factorization.

641632655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222985.

The product of its digits is 129600, while the sum is 38.

The square root of 641632655 is about 25330.4689060428. The cubic root of 641632655 is about 862.5060555480.

The spelling of 641632655 in words is "six hundred forty-one million, six hundred thirty-two thousand, six hundred fifty-five".