2154440045261 has 12 divisors (see below), whose sum is σ = 2506217258880. Its totient is φ = 1846639390680.

The previous prime is 2154440045243. The next prime is 2154440045267. The reversal of 2154440045261 is 1625400444512.

It is not a de Polignac number, because 2154440045261 - 2¹⁴ = 2154440028877 is a prime.

It is a super-4 number, since 4×2154440045261⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154440045267) 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 11 ways as a sum of consecutive naturals, for example, 4399460 + ... + 4864578.

It is an arithmetic number, because the mean of its divisors is an integer number (208851438240).

Almost surely, 2^{2154440045261} is an apocalyptic number.

It is an amenable number.

2154440045261 is a deficient number, since it is larger than the sum of its proper divisors (351777213619).

2154440045261 is an equidigital number, since it uses as much as digits as its factorization.

2154440045261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559664 (or 559657 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 38.

Adding to 2154440045261 its reverse (1625400444512), we get a palindrome (3779840489773).

The spelling of 2154440045261 in words is "two trillion, one hundred fifty-four billion, four hundred forty million, forty-five thousand, two hundred sixty-one".