55717228561 has 8 divisors (see below), whose sum is σ = 59018159304. Its totient is φ = 52418903040.

The previous prime is 55717228549. The next prime is 55717228571. The reversal of 55717228561 is 16582271755.

It can be written as a sum of positive squares in 4 ways, for example, as 10194738961 + 45522489600 = 100969^2 + 213360^2 .

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 55717228561 - 2¹⁷ = 55717097489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55717228571) 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, 607180 + ... + 692893.

It is an arithmetic number, because the mean of its divisors is an integer number (7377269913).

Almost surely, 2^55717228561 is an apocalyptic number.

It is an amenable number.

55717228561 is a deficient number, since it is larger than the sum of its proper divisors (3300930743).

55717228561 is a wasteful number, since it uses less digits than its factorization.

55717228561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302611.

The product of its digits is 1176000, while the sum is 49.

The spelling of 55717228561 in words is "fifty-five billion, seven hundred seventeen million, two hundred twenty-eight thousand, five hundred sixty-one".