2168187515409 has 16 divisors (see below), whose sum is σ = 2908958925312. Its totient is φ = 1436454233088.

The previous prime is 2168187515383. The next prime is 2168187515413. The reversal of 2168187515409 is 9045157818612.

It is a happy number.

It is not a de Polignac number, because 2168187515409 - 2¹⁹ = 2168186991121 is a prime.

It is a super-2 number, since 2×2168187515409² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2168187515419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1615504 + ... + 2635569.

It is an arithmetic number, because the mean of its divisors is an integer number (181809932832).

Almost surely, 2^{2168187515409} is an apocalyptic number.

It is an amenable number.

2168187515409 is a deficient number, since it is larger than the sum of its proper divisors (740771409903).

2168187515409 is a wasteful number, since it uses less digits than its factorization.

2168187515409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252136.

The product of its (nonzero) digits is 4838400, while the sum is 57.

The spelling of 2168187515409 in words is "two trillion, one hundred sixty-eight billion, one hundred eighty-seven million, five hundred fifteen thousand, four hundred nine".