82665400275421 has 2 divisors, whose sum is σ = 82665400275422. Its totient is φ = 82665400275420.

The previous prime is 82665400275379. The next prime is 82665400275443. The reversal of 82665400275421 is 12457200456628.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79267166110521 + 3398234164900 = 8903211^2 + 1843430^2 .

It is a cyclic number.

It is not a de Polignac number, because 82665400275421 - 2¹⁹ = 82665399751133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82665400275461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41332700137710 + 41332700137711.

It is an arithmetic number, because the mean of its divisors is an integer number (41332700137711).

Almost surely, 2^{82665400275421} is an apocalyptic number.

It is an amenable number.

82665400275421 is a deficient number, since it is larger than the sum of its proper divisors (1).

82665400275421 is an equidigital number, since it uses as much as digits as its factorization.

82665400275421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6451200, while the sum is 52.

The spelling of 82665400275421 in words is "eighty-two trillion, six hundred sixty-five billion, four hundred million, two hundred seventy-five thousand, four hundred twenty-one".