61827319861 has 2 divisors, whose sum is σ = 61827319862. Its totient is φ = 61827319860.

The previous prime is 61827319859. The next prime is 61827319867. The reversal of 61827319861 is 16891372816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61677722500 + 149597361 = 248350^2 + 12231^2 .

It is a cyclic number.

It is not a de Polignac number, because 61827319861 - 2¹ = 61827319859 is a prime.

Together with 61827319859, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 61827319799 and 61827319808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61827319867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30913659930 + 30913659931.

It is an arithmetic number, because the mean of its divisors is an integer number (30913659931).

Almost surely, 2^61827319861 is an apocalyptic number.

It is an amenable number.

61827319861 is a deficient number, since it is larger than the sum of its proper divisors (1).

61827319861 is an equidigital number, since it uses as much as digits as its factorization.

61827319861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The spelling of 61827319861 in words is "sixty-one billion, eight hundred twenty-seven million, three hundred nineteen thousand, eight hundred sixty-one".