2111450540161 has 4 divisors (see below), whose sum is σ = 2151289229652. Its totient is φ = 2071611850672.

The previous prime is 2111450540117. The next prime is 2111450540191. The reversal of 2111450540161 is 1610450541112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1811769840400 + 299680699761 = 1346020^2 + 547431^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111450540161 - 2¹³ = 2111450531969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111450540191) 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, 19919344666 + ... + 19919344771.

It is an arithmetic number, because the mean of its divisors is an integer number (537822307413).

Almost surely, 2^{2111450540161} is an apocalyptic number.

It is an amenable number.

2111450540161 is a deficient number, since it is larger than the sum of its proper divisors (39838689491).

2111450540161 is an equidigital number, since it uses as much as digits as its factorization.

2111450540161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39838689490.

The product of its (nonzero) digits is 4800, while the sum is 31.

The spelling of 2111450540161 in words is "two trillion, one hundred eleven billion, four hundred fifty million, five hundred forty thousand, one hundred sixty-one".