61271387455829 has 2 divisors, whose sum is σ = 61271387455830. Its totient is φ = 61271387455828.

The previous prime is 61271387455823. The next prime is 61271387455909. The reversal of 61271387455829 is 92855478317216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52963025104900 + 8308362350929 = 7277570^2 + 2882423^2 .

It is a cyclic number.

It is not a de Polignac number, because 61271387455829 - 2¹² = 61271387451733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61271387455823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30635693727914 + 30635693727915.

It is an arithmetic number, because the mean of its divisors is an integer number (30635693727915).

Almost surely, 2^{61271387455829} is an apocalyptic number.

It is an amenable number.

61271387455829 is a deficient number, since it is larger than the sum of its proper divisors (1).

61271387455829 is an equidigital number, since it uses as much as digits as its factorization.

61271387455829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 203212800, while the sum is 68.

The spelling of 61271387455829 in words is "sixty-one trillion, two hundred seventy-one billion, three hundred eighty-seven million, four hundred fifty-five thousand, eight hundred twenty-nine".