636424874845 has 8 divisors (see below), whose sum is σ = 764086259160. Its totient is φ = 508888960320.

The previous prime is 636424874821. The next prime is 636424874861. The reversal of 636424874845 is 548478424636.

It can be written as a sum of positive squares in 4 ways, for example, as 119261096964 + 517163777881 = 345342^2 + 719141^2 .

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

It is not a de Polignac number, because 636424874845 - 2⁹ = 636424874333 is a prime.

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, 31356286 + ... + 31376575.

It is an arithmetic number, because the mean of its divisors is an integer number (95510782395).

Almost surely, 2^636424874845 is an apocalyptic number.

It is an amenable number.

636424874845 is a deficient number, since it is larger than the sum of its proper divisors (127661384315).

636424874845 is a wasteful number, since it uses less digits than its factorization.

636424874845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62734895.

The product of its digits is 123863040, while the sum is 61.

The spelling of 636424874845 in words is "six hundred thirty-six billion, four hundred twenty-four million, eight hundred seventy-four thousand, eight hundred forty-five".