561181764361 has 4 divisors (see below), whose sum is σ = 561188689300. Its totient is φ = 561174839424.

The previous prime is 561181764337. The next prime is 561181764373. The reversal of 561181764361 is 163467181165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 407375827600 + 153805936761 = 638260^2 + 392181^2 .

It is a cyclic number.

It is not a de Polignac number, because 561181764361 - 2³¹ = 559034280713 is a prime.

It is a super-3 number, since 3×561181764361³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561181764331) 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, 3339456 + ... + 3503473.

It is an arithmetic number, because the mean of its divisors is an integer number (140297172325).

Almost surely, 2^561181764361 is an apocalyptic number.

It is an amenable number.

561181764361 is a deficient number, since it is larger than the sum of its proper divisors (6924939).

561181764361 is an equidigital number, since it uses as much as digits as its factorization.

561181764361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6924938.

The product of its digits is 725760, while the sum is 49.

The spelling of 561181764361 in words is "five hundred sixty-one billion, one hundred eighty-one million, seven hundred sixty-four thousand, three hundred sixty-one".