636381689703 has 4 divisors (see below), whose sum is σ = 848508919608. Its totient is φ = 424254459800.

The previous prime is 636381689653. The next prime is 636381689743. The reversal of 636381689703 is 307986183636.

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

It is a cyclic number.

It is not a de Polignac number, because 636381689703 - 2¹³ = 636381681511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636381689743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106063614948 + ... + 106063614953.

It is an arithmetic number, because the mean of its divisors is an integer number (212127229902).

Almost surely, 2^636381689703 is an apocalyptic number.

636381689703 is a deficient number, since it is larger than the sum of its proper divisors (212127229905).

636381689703 is a wasteful number, since it uses less digits than its factorization.

636381689703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212127229904.

The product of its (nonzero) digits is 23514624, while the sum is 60.

The spelling of 636381689703 in words is "six hundred thirty-six billion, three hundred eighty-one million, six hundred eighty-nine thousand, seven hundred three".