2621166563543 has 24 divisors (see below), whose sum is σ = 2894431896720. Its totient is φ = 2371891491200.

The previous prime is 2621166563501. The next prime is 2621166563563. The reversal of 2621166563543 is 3453656611262.

2621166563543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2621166563543 - 2¹⁸ = 2621166301399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2621166563491 and 2621166563500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621166563563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23054171 + ... + 23167587.

It is an arithmetic number, because the mean of its divisors is an integer number (120601329030).

Almost surely, 2^{2621166563543} is an apocalyptic number.

2621166563543 is a deficient number, since it is larger than the sum of its proper divisors (273265333177).

2621166563543 is a wasteful number, since it uses less digits than its factorization.

2621166563543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114319 (or 114308 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 50.

The spelling of 2621166563543 in words is "two trillion, six hundred twenty-one billion, one hundred sixty-six million, five hundred sixty-three thousand, five hundred forty-three".