61343788081 has 2 divisors, whose sum is σ = 61343788082. Its totient is φ = 61343788080.

The previous prime is 61343788069. The next prime is 61343788147. The reversal of 61343788081 is 18088734316.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48041625856 + 13302162225 = 219184^2 + 115335^2 .

It is a cyclic number.

It is not a de Polignac number, because 61343788081 - 2⁵ = 61343788049 is a prime.

It is a super-2 number, since 2×61343788081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61343788061) 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, 30671894040 + 30671894041.

It is an arithmetic number, because the mean of its divisors is an integer number (30671894041).

Almost surely, 2^61343788081 is an apocalyptic number.

It is an amenable number.

61343788081 is a deficient number, since it is larger than the sum of its proper divisors (1).

61343788081 is an equidigital number, since it uses as much as digits as its factorization.

61343788081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 61343788081 in words is "sixty-one billion, three hundred forty-three million, seven hundred eighty-eight thousand, eighty-one".