39659668819 has 4 divisors (see below), whose sum is σ = 39660900696. Its totient is φ = 39658436944.

The previous prime is 39659668813. The next prime is 39659668859. The reversal of 39659668819 is 91886695693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91886695693 = 13 ⋅7068207361.

It is a cyclic number.

It is not a de Polignac number, because 39659668819 - 2¹¹ = 39659666771 is a prime.

It is a super-2 number, since 2×39659668819² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39659668813) 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, 566314 + ... + 632479.

It is an arithmetic number, because the mean of its divisors is an integer number (9915225174).

Almost surely, 2^39659668819 is an apocalyptic number.

39659668819 is a deficient number, since it is larger than the sum of its proper divisors (1231877).

39659668819 is a wasteful number, since it uses less digits than its factorization.

39659668819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231876.

The product of its digits is 151165440, while the sum is 70.

The spelling of 39659668819 in words is "thirty-nine billion, six hundred fifty-nine million, six hundred sixty-eight thousand, eight hundred nineteen".