61530065343221 has 4 divisors (see below), whose sum is σ = 61530134387244. Its totient is φ = 61529996299200.

The previous prime is 61530065343211. The next prime is 61530065343283. The reversal of 61530065343221 is 12234356003516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53670481128196 + 7859584215025 = 7326014^2 + 2803495^2 .

It is a cyclic number.

It is not a de Polignac number, because 61530065343221 - 2⁴² = 57132018832117 is a prime.

It is a super-2 number, since 2×61530065343221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61530065343211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33167540 + ... + 34973501.

It is an arithmetic number, because the mean of its divisors is an integer number (15382533596811).

Almost surely, 2^{61530065343221} is an apocalyptic number.

It is an amenable number.

61530065343221 is a deficient number, since it is larger than the sum of its proper divisors (69044023).

61530065343221 is an equidigital number, since it uses as much as digits as its factorization.

61530065343221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69044022.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 61530065343221 in words is "sixty-one trillion, five hundred thirty billion, sixty-five million, three hundred forty-three thousand, two hundred twenty-one".