2161918330069 has 16 divisors (see below), whose sum is σ = 2248622360320. Its totient is φ = 2076706382400.

The previous prime is 2161918330031. The next prime is 2161918330087. The reversal of 2161918330069 is 9600338191612.

It is a cyclic number.

It is not a de Polignac number, because 2161918330069 - 2¹⁷ = 2161918198997 is a prime.

It is a super-2 number, since 2×2161918330069² (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 (2161918330669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66192547 + ... + 66225199.

It is an arithmetic number, because the mean of its divisors is an integer number (140538897520).

Almost surely, 2^{2161918330069} is an apocalyptic number.

It is an amenable number.

2161918330069 is a deficient number, since it is larger than the sum of its proper divisors (86704030251).

2161918330069 is a wasteful number, since it uses less digits than its factorization.

2161918330069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55420.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 2161918330069 in words is "two trillion, one hundred sixty-one billion, nine hundred eighteen million, three hundred thirty thousand, sixty-nine".