1640636111 has 16 divisors (see below), whose sum is σ = 1793340000. Its totient is φ = 1494976896.

The previous prime is 1640636099. The next prime is 1640636143. The reversal of 1640636111 is 1116360461.

It is a cyclic number.

It is not a de Polignac number, because 1640636111 - 2⁶ = 1640636047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640636171) 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 15 ways as a sum of consecutive naturals, for example, 142685 + ... + 153753.

It is an arithmetic number, because the mean of its divisors is an integer number (112083750).

Almost surely, 2^1640636111 is an apocalyptic number.

1640636111 is a deficient number, since it is larger than the sum of its proper divisors (152703889).

1640636111 is a wasteful number, since it uses less digits than its factorization.

1640636111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11386.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1640636111 is about 40504.7665219786. The cubic root of 1640636111 is about 1179.4261575898.

Adding to 1640636111 its reverse (1116360461), we get a palindrome (2756996572).

The spelling of 1640636111 in words is "one billion, six hundred forty million, six hundred thirty-six thousand, one hundred eleven".