61618205175561 has 32 divisors (see below), whose sum is σ = 94434861168000. Its totient is φ = 39661944283584.

The previous prime is 61618205175557. The next prime is 61618205175581. The reversal of 61618205175561 is 16557150281616.

61618205175561 is a `hidden beast` number, since 6 + 1 + 6 + 1 + 8 + 2 + 0 + 5 + 1 + 75 + 561 = 666.

It is not a de Polignac number, because 61618205175561 - 2² = 61618205175557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61618205175498 and 61618205175507.

It is not an unprimeable number, because it can be changed into a prime (61618205175581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112093366 + ... + 112641728.

It is an arithmetic number, because the mean of its divisors is an integer number (2951089411500).

Almost surely, 2^{61618205175561} is an apocalyptic number.

It is an amenable number.

61618205175561 is a deficient number, since it is larger than the sum of its proper divisors (32816655992439).

61618205175561 is a wasteful number, since it uses less digits than its factorization.

61618205175561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691910 (or 691904 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 54.

The spelling of 61618205175561 in words is "sixty-one trillion, six hundred eighteen billion, two hundred five million, one hundred seventy-five thousand, five hundred sixty-one".