61208772387929 has 2 divisors, whose sum is σ = 61208772387930. Its totient is φ = 61208772387928.

The previous prime is 61208772387827. The next prime is 61208772388031. The reversal of 61208772387929 is 92978327780216.

61208772387929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (61208772387827) and next prime (61208772388031).

It can be written as a sum of positive squares in only one way, i.e., 49456731372304 + 11752041015625 = 7032548^2 + 3428125^2 .

It is a cyclic number.

It is not a de Polignac number, because 61208772387929 - 2³⁶ = 61140052911193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61208772087929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30604386193964 + 30604386193965.

It is an arithmetic number, because the mean of its divisors is an integer number (30604386193965).

Almost surely, 2^{61208772387929} is an apocalyptic number.

It is an amenable number.

61208772387929 is a deficient number, since it is larger than the sum of its proper divisors (1).

61208772387929 is an equidigital number, since it uses as much as digits as its factorization.

61208772387929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256048128, while the sum is 71.

The spelling of 61208772387929 in words is "sixty-one trillion, two hundred eight billion, seven hundred seventy-two million, three hundred eighty-seven thousand, nine hundred twenty-nine".