65639048623 has 4 divisors (see below), whose sum is σ = 65718228040. Its totient is φ = 65559869208.

The previous prime is 65639048599. The next prime is 65639048633. The reversal of 65639048623 is 32684093656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65639048623 is a prime.

It is a super-2 number, since 2×65639048623² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65639048633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39588465 + ... + 39590122.

It is an arithmetic number, because the mean of its divisors is an integer number (16429557010).

Almost surely, 2^65639048623 is an apocalyptic number.

65639048623 is a deficient number, since it is larger than the sum of its proper divisors (79179417).

65639048623 is an equidigital number, since it uses as much as digits as its factorization.

65639048623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79179416.

The product of its (nonzero) digits is 5598720, while the sum is 52.

The spelling of 65639048623 in words is "sixty-five billion, six hundred thirty-nine million, forty-eight thousand, six hundred twenty-three".