2161500653544 has 32 divisors (see below), whose sum is σ = 5417227347840. Its totient is φ = 718703456000.

The previous prime is 2161500653519. The next prime is 2161500653561. The reversal of 2161500653544 is 4453560051612.

It is a super-2 number, since 2×2161500653544² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2161500653496 and 2161500653505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112287792 + ... + 112307039.

It is an arithmetic number, because the mean of its divisors is an integer number (169288354620).

Almost surely, 2^{2161500653544} is an apocalyptic number.

2161500653544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2161500653544 is an abundant number, since it is smaller than the sum of its proper divisors (3255726694296).

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

2161500653544 is a wasteful number, since it uses less digits than its factorization.

2161500653544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224595241 (or 224595237 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 2161500653544 in words is "two trillion, one hundred sixty-one billion, five hundred million, six hundred fifty-three thousand, five hundred forty-four".