2161500653543 has 16 divisors (see below), whose sum is σ = 2697061556736. Its totient is φ = 1682908974240.

The previous prime is 2161500653519. The next prime is 2161500653561. The reversal of 2161500653543 is 3453560051612.

It is a cyclic number.

It is not a de Polignac number, because 2161500653543 - 2⁶ = 2161500653479 is a prime.

It is a super-2 number, since 2×2161500653543² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161500653543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161500613543) 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, 11382296 + ... + 11570637.

It is an arithmetic number, because the mean of its divisors is an integer number (168566347296).

Almost surely, 2^{2161500653543} is an apocalyptic number.

2161500653543 is a deficient number, since it is larger than the sum of its proper divisors (535560903193).

2161500653543 is a wasteful number, since it uses less digits than its factorization.

2161500653543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22954174.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 2161500653543 in words is "two trillion, one hundred sixty-one billion, five hundred million, six hundred fifty-three thousand, five hundred forty-three".