61111721633 has 2 divisors, whose sum is σ = 61111721634. Its totient is φ = 61111721632.

The previous prime is 61111721623. The next prime is 61111721681. The reversal of 61111721633 is 33612711116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58077144064 + 3034577569 = 240992^2 + 55087^2 .

It is a cyclic number.

It is not a de Polignac number, because 61111721633 - 2²⁸ = 60843286177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61111721633.

It is not a weakly prime, because it can be changed into another prime (61111721623) 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, 30555860816 + 30555860817.

It is an arithmetic number, because the mean of its divisors is an integer number (30555860817).

Almost surely, 2^61111721633 is an apocalyptic number.

It is an amenable number.

61111721633 is a deficient number, since it is larger than the sum of its proper divisors (1).

61111721633 is an equidigital number, since it uses as much as digits as its factorization.

61111721633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The spelling of 61111721633 in words is "sixty-one billion, one hundred eleven million, seven hundred twenty-one thousand, six hundred thirty-three".