61377540618733 has 2 divisors, whose sum is σ = 61377540618734. Its totient is φ = 61377540618732.

The previous prime is 61377540618721. The next prime is 61377540618761. The reversal of 61377540618733 is 33781604577316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47251834756009 + 14125705862724 = 6873997^2 + 3758418^2 .

It is a cyclic number.

It is not a de Polignac number, because 61377540618733 - 2⁹ = 61377540618221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61377540618763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30688770309366 + 30688770309367.

It is an arithmetic number, because the mean of its divisors is an integer number (30688770309367).

Almost surely, 2^{61377540618733} is an apocalyptic number.

It is an amenable number.

61377540618733 is a deficient number, since it is larger than the sum of its proper divisors (1).

61377540618733 is an equidigital number, since it uses as much as digits as its factorization.

61377540618733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53343360, while the sum is 61.

The spelling of 61377540618733 in words is "sixty-one trillion, three hundred seventy-seven billion, five hundred forty million, six hundred eighteen thousand, seven hundred thirty-three".