544251661 has 4 divisors (see below), whose sum is σ = 544311900. Its totient is φ = 544191424.

The previous prime is 544251649. The next prime is 544251679. The reversal of 544251661 is 166152445.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 166152445 = 5 ⋅33230489.

It can be written as a sum of positive squares in 2 ways, for example, as 195720100 + 348531561 = 13990^2 + 18669^2 .

It is a cyclic number.

It is not a de Polignac number, because 544251661 - 2²⁷ = 410033933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (544251601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13516 + ... + 35653.

It is an arithmetic number, because the mean of its divisors is an integer number (136077975).

Almost surely, 2^544251661 is an apocalyptic number.

It is an amenable number.

544251661 is a deficient number, since it is larger than the sum of its proper divisors (60239).

544251661 is a wasteful number, since it uses less digits than its factorization.

544251661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60238.

The product of its digits is 28800, while the sum is 34.

The square root of 544251661 is about 23329.2018937640. The cubic root of 544251661 is about 816.4568825217.

The spelling of 544251661 in words is "five hundred forty-four million, two hundred fifty-one thousand, six hundred sixty-one".