2157809041879 has 8 divisors (see below), whose sum is σ = 2289262807040. Its totient is φ = 2028143763576.

The previous prime is 2157809041877. The next prime is 2157809041891. The reversal of 2157809041879 is 9781409087512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2157809041879 - 2¹ = 2157809041877 is a prime.

It is a super-2 number, since 2×2157809041879² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157809041877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447119229 + ... + 447124054.

It is an arithmetic number, because the mean of its divisors is an integer number (286157850880).

Almost surely, 2^{2157809041879} is an apocalyptic number.

2157809041879 is a deficient number, since it is larger than the sum of its proper divisors (131453765161).

2157809041879 is a wasteful number, since it uses less digits than its factorization.

2157809041879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894243429.

The product of its (nonzero) digits is 10160640, while the sum is 61.

The spelling of 2157809041879 in words is "two trillion, one hundred fifty-seven billion, eight hundred nine million, forty-one thousand, eight hundred seventy-nine".