242618775561 has 6 divisors (see below), whose sum is σ = 350449342490. Its totient is φ = 161745850368.

The previous prime is 242618775557. The next prime is 242618775569. The reversal of 242618775561 is 165577816242.

It is a happy number.

242618775561 is a `hidden beast` number, since 2 + 4 + 2 + 6 + 1 + 8 + 7 + 75 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 161427971961 + 81190803600 = 401781^2 + 284940^2 .

It is not a de Polignac number, because 242618775561 - 2² = 242618775557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242618775498 and 242618775507.

It is not an unprimeable number, because it can be changed into a prime (242618775569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13478820856 + ... + 13478820873.

Almost surely, 2^242618775561 is an apocalyptic number.

It is an amenable number.

242618775561 is a deficient number, since it is larger than the sum of its proper divisors (107830566929).

242618775561 is a wasteful number, since it uses less digits than its factorization.

242618775561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26957641735 (or 26957641732 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 242618775561 in words is "two hundred forty-two billion, six hundred eighteen million, seven hundred seventy-five thousand, five hundred sixty-one".