61004574661 has 2 divisors, whose sum is σ = 61004574662. Its totient is φ = 61004574660.

The previous prime is 61004574643. The next prime is 61004574671. The reversal of 61004574661 is 16647540016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60925542561 + 79032100 = 246831^2 + 8890^2 .

It is a cyclic number.

It is not a de Polignac number, because 61004574661 - 2²⁷ = 60870356933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61004574611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30502287330 + 30502287331.

It is an arithmetic number, because the mean of its divisors is an integer number (30502287331).

Almost surely, 2^61004574661 is an apocalyptic number.

It is an amenable number.

61004574661 is a deficient number, since it is larger than the sum of its proper divisors (1).

61004574661 is an equidigital number, since it uses as much as digits as its factorization.

61004574661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 61004574661 in words is "sixty-one billion, four million, five hundred seventy-four thousand, six hundred sixty-one".