636646055 has 8 divisors (see below), whose sum is σ = 768392352. Its totient is φ = 506372128.

The previous prime is 636646051. The next prime is 636646057. The reversal of 636646055 is 550646636.

It is a happy number.

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 636646055 - 2² = 636646051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636646051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367139 + ... + 368868.

It is an arithmetic number, because the mean of its divisors is an integer number (96049044).

Almost surely, 2^636646055 is an apocalyptic number.

636646055 is a deficient number, since it is larger than the sum of its proper divisors (131746297).

636646055 is a wasteful number, since it uses less digits than its factorization.

636646055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736185.

The product of its (nonzero) digits is 388800, while the sum is 41.

The square root of 636646055 is about 25231.8460481987. The cubic root of 636646055 is about 860.2658520974.

The spelling of 636646055 in words is "six hundred thirty-six million, six hundred forty-six thousand, fifty-five".