561755557165 has 16 divisors (see below), whose sum is σ = 745462921536. Its totient is φ = 402952924800.

The previous prime is 561755557141. The next prime is 561755557189.

561755557165 is nontrivially palindromic in base 10.

561755557165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (561755557141) and next prime (561755557189).

It is not a de Polignac number, because 561755557165 - 2¹¹ = 561755555117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69953091 + ... + 69961120.

It is an arithmetic number, because the mean of its divisors is an integer number (46591432596).

Almost surely, 2^561755557165 is an apocalyptic number.

561755557165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561755557165 is a deficient number, since it is larger than the sum of its proper divisors (183707364371).

561755557165 is a wasteful number, since it uses less digits than its factorization.

561755557165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139914300.

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

The spelling of 561755557165 in words is "five hundred sixty-one billion, seven hundred fifty-five million, five hundred fifty-seven thousand, one hundred sixty-five".