19806064477 has 2 divisors, whose sum is σ = 19806064478. Its totient is φ = 19806064476.

The previous prime is 19806064471. The next prime is 19806064507. The reversal of 19806064477 is 77446060891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18767356036 + 1038708441 = 136994^2 + 32229^2 .

It is a cyclic number.

It is not a de Polignac number, because 19806064477 - 2⁷ = 19806064349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19806064471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9903032238 + 9903032239.

It is an arithmetic number, because the mean of its divisors is an integer number (9903032239).

Almost surely, 2^19806064477 is an apocalyptic number.

It is an amenable number.

19806064477 is a deficient number, since it is larger than the sum of its proper divisors (1).

19806064477 is an equidigital number, since it uses as much as digits as its factorization.

19806064477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 19806064477 in words is "nineteen billion, eight hundred six million, sixty-four thousand, four hundred seventy-seven".