2102166511544 has 128 divisors (see below), whose sum is σ = 4422861031680. Its totient is φ = 928647244800.

The previous prime is 2102166511531. The next prime is 2102166511553. The reversal of 2102166511544 is 4451156612012.

It is a junction number, because it is equal to n+sod(n) for n = 2102166511498 and 2102166511507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211672259 + ... + 211682189.

It is an arithmetic number, because the mean of its divisors is an integer number (34553601810).

Almost surely, 2^{2102166511544} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2102166511544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2211430515840).

2102166511544 is an abundant number, since it is smaller than the sum of its proper divisors (2320694520136).

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

2102166511544 is a wasteful number, since it uses less digits than its factorization.

2102166511544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501 (or 10497 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 2102166511544 in words is "two trillion, one hundred two billion, one hundred sixty-six million, five hundred eleven thousand, five hundred forty-four".