28511644189961 has 2 divisors, whose sum is σ = 28511644189962. Its totient is φ = 28511644189960.

The previous prime is 28511644189901. The next prime is 28511644189967. The reversal of 28511644189961 is 16998144611582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26960436214336 + 1551207975625 = 5192344^2 + 1245475^2 .

It is a cyclic number.

It is not a de Polignac number, because 28511644189961 - 2¹⁸ = 28511643927817 is a prime.

It is not a weakly prime, because it can be changed into another prime (28511644189967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14255822094980 + 14255822094981.

It is an arithmetic number, because the mean of its divisors is an integer number (14255822094981).

Almost surely, 2^{28511644189961} is an apocalyptic number.

It is an amenable number.

28511644189961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28511644189961 is an equidigital number, since it uses as much as digits as its factorization.

28511644189961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29859840, while the sum is 65.

The spelling of 28511644189961 in words is "twenty-eight trillion, five hundred eleven billion, six hundred forty-four million, one hundred eighty-nine thousand, nine hundred sixty-one".