2164266878925 has 24 divisors (see below), whose sum is σ = 3579760233856. Its totient is φ = 1153789971840.

The previous prime is 2164266878857. The next prime is 2164266878951. The reversal of 2164266878925 is 5298786624612.

It is not a de Polignac number, because 2164266878925 - 2²⁴ = 2164250101709 is a prime.

It is a super-2 number, since 2×2164266878925² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5891749 + ... + 6248298.

Almost surely, 2^{2164266878925} is an apocalyptic number.

2164266878925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2164266878925 is a deficient number, since it is larger than the sum of its proper divisors (1415493354931).

2164266878925 is a wasteful number, since it uses less digits than its factorization.

2164266878925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12142437 (or 12142432 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 66.

The spelling of 2164266878925 in words is "two trillion, one hundred sixty-four billion, two hundred sixty-six million, eight hundred seventy-eight thousand, nine hundred twenty-five".