561557755165 has 8 divisors (see below), whose sum is σ = 735130152288. Its totient is φ = 408405640080.

The previous prime is 561557755163. The next prime is 561557755217.

561557755165 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 561557755165 - 2¹ = 561557755163 is a prime.

It is a super-2 number, since 2×561557755165² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561557755163) 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, 5105070447 + ... + 5105070556.

It is an arithmetic number, because the mean of its divisors is an integer number (91891269036).

Almost surely, 2^561557755165 is an apocalyptic number.

561557755165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561557755165 is a deficient number, since it is larger than the sum of its proper divisors (173572397123).

561557755165 is a wasteful number, since it uses less digits than its factorization.

561557755165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210141019.

The product of its digits is 27562500, while the sum is 58.

The spelling of 561557755165 in words is "five hundred sixty-one billion, five hundred fifty-seven million, seven hundred fifty-five thousand, one hundred sixty-five".