1636940386651 has 8 divisors (see below), whose sum is σ = 1640181767024. Its totient is φ = 1633699432800.

The previous prime is 1636940386577. The next prime is 1636940386673. The reversal of 1636940386651 is 1566830496361.

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 1636940386651 - 2¹⁷ = 1636940255579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1636940386451) 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, 8217805 + ... + 8414641.

It is an arithmetic number, because the mean of its divisors is an integer number (205022720878).

Almost surely, 2^{1636940386651} is an apocalyptic number.

1636940386651 is a deficient number, since it is larger than the sum of its proper divisors (3241380373).

1636940386651 is a wasteful number, since it uses less digits than its factorization.

1636940386651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213261.

The product of its (nonzero) digits is 16796160, while the sum is 58.

The spelling of 1636940386651 in words is "one trillion, six hundred thirty-six billion, nine hundred forty million, three hundred eighty-six thousand, six hundred fifty-one".