544775371921 has 27 divisors (see below), whose sum is σ = 636259551067. Its totient is φ = 465999871040.

The previous prime is 544775371891. The next prime is 544775371949. The reversal of 544775371921 is 129173577445.

The square root of 544775371921 is 738089.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 424133075025 + 120642296896 = 651255^2 + 347336^2 .

It is not a de Polignac number, because 544775371921 - 2⁷ = 544775371793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (544775371991) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 138020670 + ... + 138024616.

Almost surely, 2^544775371921 is an apocalyptic number.

544775371921 is the 738089-th square number.

544775371921 is the 369045-th centered octagonal number.

It is an amenable number.

544775371921 is a deficient number, since it is larger than the sum of its proper divisors (91484179146).

544775371921 is an frugal number, since it uses more digits than its factorization.

544775371921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7950 (or 3975 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 55.

The spelling of 544775371921 in words is "five hundred forty-four billion, seven hundred seventy-five million, three hundred seventy-one thousand, nine hundred twenty-one".