1638100335649 has 16 divisors (see below), whose sum is σ = 1680532490560. Its totient is φ = 1595866950720.

The previous prime is 1638100335637. The next prime is 1638100335689. The reversal of 1638100335649 is 9465330018361.

It is a cyclic number.

It is not a de Polignac number, because 1638100335649 - 2¹⁷ = 1638100204577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1638100335689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154576219 + ... + 154586815.

It is an arithmetic number, because the mean of its divisors is an integer number (105033280660).

Almost surely, 2^{1638100335649} is an apocalyptic number.

It is an amenable number.

1638100335649 is a deficient number, since it is larger than the sum of its proper divisors (42432154911).

1638100335649 is a wasteful number, since it uses less digits than its factorization.

1638100335649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19600.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 1638100335649 in words is "one trillion, six hundred thirty-eight billion, one hundred million, three hundred thirty-five thousand, six hundred forty-nine".