1072628865821 has 2 divisors, whose sum is σ = 1072628865822. Its totient is φ = 1072628865820.

The previous prime is 1072628865817. The next prime is 1072628865923. The reversal of 1072628865821 is 1285688262701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679231464025 + 393397401796 = 824155^2 + 627214^2 .

It is an emirp because it is prime and its reverse (1285688262701) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1072628865821 - 2² = 1072628865817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1072628565821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536314432910 + 536314432911.

It is an arithmetic number, because the mean of its divisors is an integer number (536314432911).

Almost surely, 2^{1072628865821} is an apocalyptic number.

It is an amenable number.

1072628865821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1072628865821 is an equidigital number, since it uses as much as digits as its factorization.

1072628865821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5160960, while the sum is 56.

The spelling of 1072628865821 in words is "one trillion, seventy-two billion, six hundred twenty-eight million, eight hundred sixty-five thousand, eight hundred twenty-one".