1636868872389 has 8 divisors (see below), whose sum is σ = 2277382779072. Its totient is φ = 1043800440320.

The previous prime is 1636868872357. The next prime is 1636868872393. The reversal of 1636868872389 is 9832788686361.

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

It is not a de Polignac number, because 1636868872389 - 2⁵ = 1636868872357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1636868872389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636868872589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11861368572 + ... + 11861368709.

It is an arithmetic number, because the mean of its divisors is an integer number (284672847384).

Almost surely, 2^{1636868872389} is an apocalyptic number.

It is an amenable number.

1636868872389 is a deficient number, since it is larger than the sum of its proper divisors (640513906683).

1636868872389 is a wasteful number, since it uses less digits than its factorization.

1636868872389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23722737307.

The product of its digits is 1003290624, while the sum is 75.

The spelling of 1636868872389 in words is "one trillion, six hundred thirty-six billion, eight hundred sixty-eight million, eight hundred seventy-two thousand, three hundred eighty-nine".