544405645681 has 4 divisors (see below), whose sum is σ = 548322233200. Its totient is φ = 540489058164.

The previous prime is 544405645657. The next prime is 544405645697. The reversal of 544405645681 is 186546504445.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 544405645681 - 2²⁹ = 543868774769 is a prime.

It is a super-2 number, since 2×544405645681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (544405645081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1958293551 + ... + 1958293828.

It is an arithmetic number, because the mean of its divisors is an integer number (137080558300).

Almost surely, 2^544405645681 is an apocalyptic number.

It is an amenable number.

544405645681 is a deficient number, since it is larger than the sum of its proper divisors (3916587519).

544405645681 is a wasteful number, since it uses less digits than its factorization.

544405645681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3916587518.

The product of its (nonzero) digits is 9216000, while the sum is 52.

The spelling of 544405645681 in words is "five hundred forty-four billion, four hundred five million, six hundred forty-five thousand, six hundred eighty-one".