19662698417 has 2 divisors, whose sum is σ = 19662698418. Its totient is φ = 19662698416.

The previous prime is 19662698411. The next prime is 19662698449. The reversal of 19662698417 is 71489626691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17603717041 + 2058981376 = 132679^2 + 45376^2 .

It is a cyclic number.

It is not a de Polignac number, because 19662698417 - 2⁴ = 19662698401 is a prime.

It is not a weakly prime, because it can be changed into another prime (19662698411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9831349208 + 9831349209.

It is an arithmetic number, because the mean of its divisors is an integer number (9831349209).

Almost surely, 2^19662698417 is an apocalyptic number.

It is an amenable number.

19662698417 is a deficient number, since it is larger than the sum of its proper divisors (1).

19662698417 is an equidigital number, since it uses as much as digits as its factorization.

19662698417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 59.

The spelling of 19662698417 in words is "nineteen billion, six hundred sixty-two million, six hundred ninety-eight thousand, four hundred seventeen".