2126180669 has 4 divisors (see below), whose sum is σ = 2126814396. Its totient is φ = 2125546944.

The previous prime is 2126180657. The next prime is 2126180677. The reversal of 2126180669 is 9660816212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2062340569 + 63840100 = 45413^2 + 7990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126180669 - 2²⁴ = 2109403453 is a prime.

It is a super-2 number, since 2×2126180669² = 9041288474458575122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2126180569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311804 + ... + 318549.

It is an arithmetic number, because the mean of its divisors is an integer number (531703599).

Almost surely, 2^2126180669 is an apocalyptic number.

It is an amenable number.

2126180669 is a deficient number, since it is larger than the sum of its proper divisors (633727).

2126180669 is an equidigital number, since it uses as much as digits as its factorization.

2126180669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633726.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 2126180669 is about 46110.5266614902. The cubic root of 2126180669 is about 1285.8788557521.

The spelling of 2126180669 in words is "two billion, one hundred twenty-six million, one hundred eighty thousand, six hundred sixty-nine".