636199055 has 4 divisors (see below), whose sum is σ = 763438872. Its totient is φ = 508959240.

The previous prime is 636199049. The next prime is 636199063. The reversal of 636199055 is 550991636.

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

It is not a de Polignac number, because 636199055 - 2⁶ = 636198991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 636198997 and 636199015.

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, 63619901 + ... + 63619910.

It is an arithmetic number, because the mean of its divisors is an integer number (190859718).

Almost surely, 2^636199055 is an apocalyptic number.

636199055 is a deficient number, since it is larger than the sum of its proper divisors (127239817).

636199055 is a wasteful number, since it uses less digits than its factorization.

636199055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127239816.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 636199055 is about 25222.9866391750. The cubic root of 636199055 is about 860.0644692070.

The spelling of 636199055 in words is "six hundred thirty-six million, one hundred ninety-nine thousand, fifty-five".