2161515542140 has 48 divisors (see below), whose sum is σ = 4548986717184. Its totient is φ = 862740648000.

The previous prime is 2161515542129. The next prime is 2161515542167. The reversal of 2161515542140 is 412455151612.

It is a self number, because there is not a number n which added to its sum of digits gives 2161515542140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18713565 + ... + 18828715.

It is an arithmetic number, because the mean of its divisors is an integer number (94770556608).

Almost surely, 2^{2161515542140} is an apocalyptic number.

2161515542140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161515542140 is an abundant number, since it is smaller than the sum of its proper divisors (2387471175044).

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

2161515542140 is a wasteful number, since it uses less digits than its factorization.

2161515542140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117178 (or 117176 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 37.

The spelling of 2161515542140 in words is "two trillion, one hundred sixty-one billion, five hundred fifteen million, five hundred forty-two thousand, one hundred forty".