76776490566221 has 2 divisors, whose sum is σ = 76776490566222. Its totient is φ = 76776490566220.

The previous prime is 76776490566179. The next prime is 76776490566239. The reversal of 76776490566221 is 12266509467767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59565517336900 + 17210973229321 = 7717870^2 + 4148611^2 .

It is an emirp because it is prime and its reverse (12266509467767) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76776490566221 - 2⁴⁶ = 6407746388557 is a prime.

It is a super-3 number, since 3×76776490566221³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76776490569221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38388245283110 + 38388245283111.

It is an arithmetic number, because the mean of its divisors is an integer number (38388245283111).

Almost surely, 2^{76776490566221} is an apocalyptic number.

It is an amenable number.

76776490566221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76776490566221 is an equidigital number, since it uses as much as digits as its factorization.

76776490566221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320060160, while the sum is 68.

The spelling of 76776490566221 in words is "seventy-six trillion, seven hundred seventy-six billion, four hundred ninety million, five hundred sixty-six thousand, two hundred twenty-one".