728611253861 has 2 divisors, whose sum is σ = 728611253862. Its totient is φ = 728611253860.

The previous prime is 728611253827. The next prime is 728611253863. The reversal of 728611253861 is 168352116827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672711636100 + 55899617761 = 820190^2 + 236431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728611253861 is a prime.

Together with 728611253863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728611253863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364305626930 + 364305626931.

It is an arithmetic number, because the mean of its divisors is an integer number (364305626931).

Almost surely, 2^728611253861 is an apocalyptic number.

It is an amenable number.

728611253861 is a deficient number, since it is larger than the sum of its proper divisors (1).

728611253861 is an equidigital number, since it uses as much as digits as its factorization.

728611253861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The spelling of 728611253861 in words is "seven hundred twenty-eight billion, six hundred eleven million, two hundred fifty-three thousand, eight hundred sixty-one".