39907640161 has 6 divisors (see below), whose sum is σ = 41236511586. Its totient is φ = 38620296000.

The previous prime is 39907640119. The next prime is 39907640189. The reversal of 39907640161 is 16104670993.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 34596000000 + 5311640161 = 186000^2 + 72881^2 .

It is not a de Polignac number, because 39907640161 - 2¹⁹ = 39907115873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39907640191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20762640 + ... + 20764561.

It is an arithmetic number, because the mean of its divisors is an integer number (6872751931).

Almost surely, 2^39907640161 is an apocalyptic number.

39907640161 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

39907640161 is a deficient number, since it is larger than the sum of its proper divisors (1328871425).

39907640161 is an equidigital number, since it uses as much as digits as its factorization.

39907640161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41527263 (or 41527232 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 39907640161 in words is "thirty-nine billion, nine hundred seven million, six hundred forty thousand, one hundred sixty-one".