39820908365161 has 27 divisors (see below), whose sum is σ = 50916847691703. Its totient is φ = 31028900622720.

The previous prime is 39820908365159. The next prime is 39820908365207. The reversal of 39820908365161 is 16156380902893.

The square root of 39820908365161 is 6310381.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9993406725225 + 29827501639936 = 3161235^2 + 5461456^2 .

It is not a de Polignac number, because 39820908365161 - 2¹ = 39820908365159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39820908365161.

It is not an unprimeable number, because it can be changed into a prime (39820908365101) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 485858361 + ... + 485940313.

Almost surely, 2^{39820908365161} is an apocalyptic number.

39820908365161 is the 6310381-st square number.

39820908365161 is the 3155191-st centered octagonal number.

It is an amenable number.

39820908365161 is a deficient number, since it is larger than the sum of its proper divisors (11095939326542).

39820908365161 is an frugal number, since it uses more digits than its factorization.

39820908365161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163942 (or 81971 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 61.

The spelling of 39820908365161 in words is "thirty-nine trillion, eight hundred twenty billion, nine hundred eight million, three hundred sixty-five thousand, one hundred sixty-one".