1639565013 has 4 divisors (see below), whose sum is σ = 2186086688. Its totient is φ = 1093043340.

The previous prime is 1639565009. The next prime is 1639565023. The reversal of 1639565013 is 3105659361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1639565013 - 2² = 1639565009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639565023) 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 3 ways as a sum of consecutive naturals, for example, 273260833 + ... + 273260838.

It is an arithmetic number, because the mean of its divisors is an integer number (546521672).

Almost surely, 2^1639565013 is an apocalyptic number.

It is an amenable number.

1639565013 is a deficient number, since it is larger than the sum of its proper divisors (546521675).

1639565013 is an equidigital number, since it uses as much as digits as its factorization.

1639565013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546521674.

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 1639565013 is about 40491.5424872899. The cubic root of 1639565013 is about 1179.1694368372.

The spelling of 1639565013 in words is "one billion, six hundred thirty-nine million, five hundred sixty-five thousand, thirteen".