8179769621773 has 2 divisors, whose sum is σ = 8179769621774. Its totient is φ = 8179769621772.

The previous prime is 8179769621707. The next prime is 8179769621809. The reversal of 8179769621773 is 3771269679718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6413470145289 + 1766299476484 = 2532483^2 + 1329022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8179769621773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8179769621696 and 8179769621705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8179769621873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4089884810886 + 4089884810887.

It is an arithmetic number, because the mean of its divisors is an integer number (4089884810887).

Almost surely, 2^{8179769621773} is an apocalyptic number.

It is an amenable number.

8179769621773 is a deficient number, since it is larger than the sum of its proper divisors (1).

8179769621773 is an equidigital number, since it uses as much as digits as its factorization.

8179769621773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336063168, while the sum is 73.

The spelling of 8179769621773 in words is "eight trillion, one hundred seventy-nine billion, seven hundred sixty-nine million, six hundred twenty-one thousand, seven hundred seventy-three".