28557477475561 has 2 divisors, whose sum is σ = 28557477475562. Its totient is φ = 28557477475560.

The previous prime is 28557477475433. The next prime is 28557477475589. The reversal of 28557477475561 is 16557477475582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27550625779161 + 1006851696400 = 5248869^2 + 1003420^2 .

It is a cyclic number.

It is not a de Polignac number, because 28557477475561 - 2⁷ = 28557477475433 is a prime.

It is not a weakly prime, because it can be changed into another prime (28557477475061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14278738737780 + 14278738737781.

It is an arithmetic number, because the mean of its divisors is an integer number (14278738737781).

Almost surely, 2^{28557477475561} is an apocalyptic number.

It is an amenable number.

28557477475561 is a deficient number, since it is larger than the sum of its proper divisors (1).

28557477475561 is an equidigital number, since it uses as much as digits as its factorization.

28557477475561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304960000, while the sum is 73.

The spelling of 28557477475561 in words is "twenty-eight trillion, five hundred fifty-seven billion, four hundred seventy-seven million, four hundred seventy-five thousand, five hundred sixty-one".