1671815382169 has 9 divisors (see below), whose sum is σ = 1685248464351. Its totient is φ = 1658488565160.

The previous prime is 1671815382163. The next prime is 1671815382191. The reversal of 1671815382169 is 9612835181761.

The square root of 1671815382169 is 1292987.

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., 998726405769 + 673088976400 = 999363^2 + 820420^2 .

It is not a de Polignac number, because 1671815382169 - 2⁹ = 1671815381657 is a prime.

It is a super-2 number, since 2×1671815382169² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671815382163) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 164204259 + ... + 164214439.

Almost surely, 2^{1671815382169} is an apocalyptic number.

1671815382169 is the 1292987-th square number.

1671815382169 is the 646494-th centered octagonal number.

It is an amenable number.

1671815382169 is a deficient number, since it is larger than the sum of its proper divisors (13433082182).

1671815382169 is an frugal number, since it uses more digits than its factorization.

1671815382169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20616 (or 10308 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 58.

The spelling of 1671815382169 in words is "one trillion, six hundred seventy-one billion, eight hundred fifteen million, three hundred eighty-two thousand, one hundred sixty-nine".