12165869401 has 15 divisors (see below), whose sum is σ = 14198977653. Its totient is φ = 10423255500.

The previous prime is 12165869399. The next prime is 12165869407. The reversal of 12165869401 is 10496856121.

The square root of 12165869401 is 110299.

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

It is not a de Polignac number, because 12165869401 - 2¹ = 12165869399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12165869407) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5403526 + ... + 5405776.

Almost surely, 2^12165869401 is an apocalyptic number.

12165869401 is the 110299-th square number.

12165869401 is the 55150-th centered octagonal number.

It is an amenable number.

12165869401 is a deficient number, since it is larger than the sum of its proper divisors (2033108252).

12165869401 is an frugal number, since it uses more digits than its factorization.

12165869401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4530 (or 2258 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 12165869401 in words is "twelve billion, one hundred sixty-five million, eight hundred sixty-nine thousand, four hundred one".