1663726424197 has 2 divisors, whose sum is σ = 1663726424198. Its totient is φ = 1663726424196.

The previous prime is 1663726424189. The next prime is 1663726424219. The reversal of 1663726424197 is 7914246273661.

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., 1056720264961 + 607006159236 = 1027969^2 + 779106^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663726424197 - 2³ = 1663726424189 is a prime.

It is a super-2 number, since 2×1663726424197² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663726424117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831863212098 + 831863212099.

It is an arithmetic number, because the mean of its divisors is an integer number (831863212099).

Almost surely, 2^{1663726424197} is an apocalyptic number.

It is an amenable number.

1663726424197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663726424197 is an equidigital number, since it uses as much as digits as its factorization.

1663726424197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 58.

The spelling of 1663726424197 in words is "one trillion, six hundred sixty-three billion, seven hundred twenty-six million, four hundred twenty-four thousand, one hundred ninety-seven".