2111661163554 has 16 divisors (see below), whose sum is σ = 4471753052448. Its totient is φ = 662481933632.

The previous prime is 2111661163553. The next prime is 2111661163583. The reversal of 2111661163554 is 4553611661112.

It is a happy number.

It is a super-2 number, since 2×2111661163554² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2111661163553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10351280112 + ... + 10351280315.

It is an arithmetic number, because the mean of its divisors is an integer number (279484565778).

Almost surely, 2^{2111661163554} is an apocalyptic number.

2111661163554 is an abundant number, since it is smaller than the sum of its proper divisors (2360091888894).

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

2111661163554 is a wasteful number, since it uses less digits than its factorization.

2111661163554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20702560449.

The product of its digits is 129600, while the sum is 42.

The spelling of 2111661163554 in words is "two trillion, one hundred eleven billion, six hundred sixty-one million, one hundred sixty-three thousand, five hundred fifty-four".