61744573421 has 2 divisors, whose sum is σ = 61744573422. Its totient is φ = 61744573420.

The previous prime is 61744573379. The next prime is 61744573439. The reversal of 61744573421 is 12437544716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36638170921 + 25106402500 = 191411^2 + 158450^2 .

It is a cyclic number.

It is not a de Polignac number, because 61744573421 - 2²⁶ = 61677464557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61744573481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30872286710 + 30872286711.

It is an arithmetic number, because the mean of its divisors is an integer number (30872286711).

Almost surely, 2^61744573421 is an apocalyptic number.

It is an amenable number.

61744573421 is a deficient number, since it is larger than the sum of its proper divisors (1).

61744573421 is an equidigital number, since it uses as much as digits as its factorization.

61744573421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 44.

The spelling of 61744573421 in words is "sixty-one billion, seven hundred forty-four million, five hundred seventy-three thousand, four hundred twenty-one".