1640042511 has 4 divisors (see below), whose sum is σ = 2186723352. Its totient is φ = 1093361672.

The previous prime is 1640042483. The next prime is 1640042519. The reversal of 1640042511 is 1152400461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1152400461 = 3 ⋅384133487.

It is a cyclic number.

It is not a de Polignac number, because 1640042511 - 2⁶ = 1640042447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640042519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273340416 + ... + 273340421.

It is an arithmetic number, because the mean of its divisors is an integer number (546680838).

Almost surely, 2^1640042511 is an apocalyptic number.

1640042511 is a deficient number, since it is larger than the sum of its proper divisors (546680841).

1640042511 is an equidigital number, since it uses as much as digits as its factorization.

1640042511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546680840.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1640042511 is about 40497.4383263929. The cubic root of 1640042511 is about 1179.2838973582.

Adding to 1640042511 its reverse (1152400461), we get a palindrome (2792442972).

The spelling of 1640042511 in words is "one billion, six hundred forty million, forty-two thousand, five hundred eleven".