2179966613841 has 27 divisors (see below), whose sum is σ = 3323419973289. Its totient is φ = 1376767866312.

The previous prime is 2179966613831. The next prime is 2179966613897. The reversal of 2179966613841 is 1483166699712.

The square root of 2179966613841 is 1476471.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2179966613841 - 2¹¹ = 2179966611793 is a prime.

It is a super-2 number, since 2×2179966613841² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2179966613831) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 84145896 + ... + 84171798.

Almost surely, 2^{2179966613841} is an apocalyptic number.

2179966613841 is the 1476471-st square number.

2179966613841 is the 738236-th centered octagonal number.

It is an amenable number.

2179966613841 is a deficient number, since it is larger than the sum of its proper divisors (1143453359448).

2179966613841 is an frugal number, since it uses more digits than its factorization.

2179966613841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51850 (or 25925 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The spelling of 2179966613841 in words is "two trillion, one hundred seventy-nine billion, nine hundred sixty-six million, six hundred thirteen thousand, eight hundred forty-one".