19716610477 has 2 divisors, whose sum is σ = 19716610478. Its totient is φ = 19716610476.

The previous prime is 19716610453. The next prime is 19716610519. The reversal of 19716610477 is 77401661791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16065309001 + 3651301476 = 126749^2 + 60426^2 .

It is a cyclic number.

It is not a de Polignac number, because 19716610477 - 2⁷ = 19716610349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19716610477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19716610777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9858305238 + 9858305239.

It is an arithmetic number, because the mean of its divisors is an integer number (9858305239).

Almost surely, 2^19716610477 is an apocalyptic number.

It is an amenable number.

19716610477 is a deficient number, since it is larger than the sum of its proper divisors (1).

19716610477 is an equidigital number, since it uses as much as digits as its factorization.

19716610477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 49.

The spelling of 19716610477 in words is "nineteen billion, seven hundred sixteen million, six hundred ten thousand, four hundred seventy-seven".