80639260511861 has 2 divisors, whose sum is σ = 80639260511862. Its totient is φ = 80639260511860.

The previous prime is 80639260511801. The next prime is 80639260511893. The reversal of 80639260511861 is 16811506293608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65957381602225 + 14681878909636 = 8121415^2 + 3831694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80639260511861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80639260511797 and 80639260511806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80639260511801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40319630255930 + 40319630255931.

It is an arithmetic number, because the mean of its divisors is an integer number (40319630255931).

Almost surely, 2^{80639260511861} is an apocalyptic number.

It is an amenable number.

80639260511861 is a deficient number, since it is larger than the sum of its proper divisors (1).

80639260511861 is an equidigital number, since it uses as much as digits as its factorization.

80639260511861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 80639260511861 in words is "eighty trillion, six hundred thirty-nine billion, two hundred sixty million, five hundred eleven thousand, eight hundred sixty-one".