2127291691669 has 4 divisors (see below), whose sum is σ = 2128070636800. Its totient is φ = 2126512746540.

The previous prime is 2127291691663. The next prime is 2127291691673. The reversal of 2127291691669 is 9661961927212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2127291691669 - 2⁷ = 2127291691541 is a prime.

It is a super-2 number, since 2×2127291691669² (a number of 25 digits) 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 (2127291691663) 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, 389468469 + ... + 389473930.

It is an arithmetic number, because the mean of its divisors is an integer number (532017659200).

Almost surely, 2^{2127291691669} is an apocalyptic number.

It is an amenable number.

2127291691669 is a deficient number, since it is larger than the sum of its proper divisors (778945131).

2127291691669 is an equidigital number, since it uses as much as digits as its factorization.

2127291691669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778945130.

The product of its digits is 8817984, while the sum is 61.

The spelling of 2127291691669 in words is "two trillion, one hundred twenty-seven billion, two hundred ninety-one million, six hundred ninety-one thousand, six hundred sixty-nine".