2161191413680 has 80 divisors (see below), whose sum is σ = 5412774435264. Its totient is φ = 797759585280.

The previous prime is 2161191413669. The next prime is 2161191413681. The reversal of 2161191413680 is 863141911612.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×2161191413680² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2161191413681) 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 15 ways as a sum of consecutive naturals, for example, 3534802 + ... + 4100878.

Almost surely, 2^{2161191413680} is an apocalyptic number.

2161191413680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161191413680 is an abundant number, since it is smaller than the sum of its proper divisors (3251583021584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161191413680 is a wasteful number, since it uses less digits than its factorization.

2161191413680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569774 (or 569768 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 2161191413680 in words is "two trillion, one hundred sixty-one billion, one hundred ninety-one million, four hundred thirteen thousand, six hundred eighty".