39605868161 has 4 divisors (see below), whose sum is σ = 39675231024. Its totient is φ = 39536505300.

The previous prime is 39605868157. The next prime is 39605868191. The reversal of 39605868161 is 16186850693.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16186850693 = 13 ⋅1245142361.

It is a cyclic number.

It is not a de Polignac number, because 39605868161 - 2² = 39605868157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39605868191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34680575 + ... + 34681716.

It is an arithmetic number, because the mean of its divisors is an integer number (9918807756).

Almost surely, 2^39605868161 is an apocalyptic number.

It is an amenable number.

39605868161 is a deficient number, since it is larger than the sum of its proper divisors (69362863).

39605868161 is an equidigital number, since it uses as much as digits as its factorization.

39605868161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69362862.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 39605868161 in words is "thirty-nine billion, six hundred five million, eight hundred sixty-eight thousand, one hundred sixty-one".