61893194609 has 2 divisors, whose sum is σ = 61893194610. Its totient is φ = 61893194608.

The previous prime is 61893194543. The next prime is 61893194647. The reversal of 61893194609 is 90649139816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39851338384 + 22041856225 = 199628^2 + 148465^2 .

It is a cyclic number.

It is not a de Polignac number, because 61893194609 - 2⁸ = 61893194353 is a prime.

It is not a weakly prime, because it can be changed into another prime (61893194009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30946597304 + 30946597305.

It is an arithmetic number, because the mean of its divisors is an integer number (30946597305).

Almost surely, 2^61893194609 is an apocalyptic number.

It is an amenable number.

61893194609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61893194609 is an equidigital number, since it uses as much as digits as its factorization.

61893194609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 61893194609 in words is "sixty-one billion, eight hundred ninety-three million, one hundred ninety-four thousand, six hundred nine".