19828855804777 has 2 divisors, whose sum is σ = 19828855804778. Its totient is φ = 19828855804776.

The previous prime is 19828855804687. The next prime is 19828855804907. The reversal of 19828855804777 is 77740855882891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16276577011776 + 3552278793001 = 4034424^2 + 1884749^2 .

It is a cyclic number.

It is not a de Polignac number, because 19828855804777 - 2³⁵ = 19794496066409 is a prime.

It is a super-3 number, since 3×19828855804777³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19828855804697 and 19828855804706.

It is not a weakly prime, because it can be changed into another prime (19828855804477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9914427902388 + 9914427902389.

It is an arithmetic number, because the mean of its divisors is an integer number (9914427902389).

Almost surely, 2^{19828855804777} is an apocalyptic number.

It is an amenable number.

19828855804777 is a deficient number, since it is larger than the sum of its proper divisors (1).

19828855804777 is an equidigital number, since it uses as much as digits as its factorization.

19828855804777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2528870400, while the sum is 79.

The spelling of 19828855804777 in words is "nineteen trillion, eight hundred twenty-eight billion, eight hundred fifty-five million, eight hundred four thousand, seven hundred seventy-seven".