61780612481213 has 2 divisors, whose sum is σ = 61780612481214. Its totient is φ = 61780612481212.

The previous prime is 61780612481209. The next prime is 61780612481221. The reversal of 61780612481213 is 31218421608716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42418166003929 + 19362446477284 = 6512923^2 + 4400278^2 .

It is a cyclic number.

It is not a de Polignac number, because 61780612481213 - 2² = 61780612481209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61780612481293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30890306240606 + 30890306240607.

It is an arithmetic number, because the mean of its divisors is an integer number (30890306240607).

Almost surely, 2^{61780612481213} is an apocalyptic number.

It is an amenable number.

61780612481213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61780612481213 is an equidigital number, since it uses as much as digits as its factorization.

61780612481213 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 50.

The spelling of 61780612481213 in words is "sixty-one trillion, seven hundred eighty billion, six hundred twelve million, four hundred eighty-one thousand, two hundred thirteen".