55544420581 has 8 divisors (see below), whose sum is σ = 59827655160. Its totient is φ = 51262698432.

The previous prime is 55544420551. The next prime is 55544420597. The reversal of 55544420581 is 18502444555.

It can be written as a sum of positive squares in 4 ways, for example, as 549480481 + 54994940100 = 23441^2 + 234510^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55544420581 - 2²¹ = 55542323429 is a prime.

It is a super-2 number, since 2×55544420581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55544420551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301246 + ... + 449263.

It is an arithmetic number, because the mean of its divisors is an integer number (7478456895).

Almost surely, 2^55544420581 is an apocalyptic number.

It is an amenable number.

55544420581 is a deficient number, since it is larger than the sum of its proper divisors (4283234579).

55544420581 is a wasteful number, since it uses less digits than its factorization.

55544420581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756215.

The product of its (nonzero) digits is 640000, while the sum is 43.

The spelling of 55544420581 in words is "fifty-five billion, five hundred forty-four million, four hundred twenty thousand, five hundred eighty-one".