61213533361 has 2 divisors, whose sum is σ = 61213533362. Its totient is φ = 61213533360.

The previous prime is 61213533307. The next prime is 61213533443. The reversal of 61213533361 is 16333531216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59222142736 + 1991390625 = 243356^2 + 44625^2 .

It is a cyclic number.

It is not a de Polignac number, because 61213533361 - 2²³ = 61205144753 is a prime.

It is not a weakly prime, because it can be changed into another prime (61213533961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606766680 + 30606766681.

It is an arithmetic number, because the mean of its divisors is an integer number (30606766681).

Almost surely, 2^61213533361 is an apocalyptic number.

It is an amenable number.

61213533361 is a deficient number, since it is larger than the sum of its proper divisors (1).

61213533361 is an equidigital number, since it uses as much as digits as its factorization.

61213533361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 34.

The spelling of 61213533361 in words is "sixty-one billion, two hundred thirteen million, five hundred thirty-three thousand, three hundred sixty-one".