2161554721452 has 48 divisors (see below), whose sum is σ = 6404606584320. Its totient is φ = 617587063056.

The previous prime is 2161554721439. The next prime is 2161554721453. The reversal of 2161554721452 is 2541274551612.

2161554721452 is a `hidden beast` number, since 2 + 1 + 6 + 155 + 47 + 2 + 1 + 452 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2161554721398 and 2161554721407.

It is not an unprimeable number, because it can be changed into a prime (2161554721453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1429598928 + ... + 1429600439.

It is an arithmetic number, because the mean of its divisors is an integer number (133429303840).

Almost surely, 2^{2161554721452} is an apocalyptic number.

It is an amenable number.

2161554721452 is an abundant number, since it is smaller than the sum of its proper divisors (4243051862868).

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

2161554721452 is a wasteful number, since it uses less digits than its factorization.

2161554721452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859199387 (or 2859199379 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The spelling of 2161554721452 in words is "two trillion, one hundred sixty-one billion, five hundred fifty-four million, seven hundred twenty-one thousand, four hundred fifty-two".