82768667621 has 2 divisors, whose sum is σ = 82768667622. Its totient is φ = 82768667620.

The previous prime is 82768667609. The next prime is 82768667671. The reversal of 82768667621 is 12676686728.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79347002596 + 3421665025 = 281686^2 + 58495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82768667621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82768667671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41384333810 + 41384333811.

It is an arithmetic number, because the mean of its divisors is an integer number (41384333811).

Almost surely, 2^82768667621 is an apocalyptic number.

It is an amenable number.

82768667621 is a deficient number, since it is larger than the sum of its proper divisors (1).

82768667621 is an equidigital number, since it uses as much as digits as its factorization.

82768667621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 59.

The spelling of 82768667621 in words is "eighty-two billion, seven hundred sixty-eight million, six hundred sixty-seven thousand, six hundred twenty-one".