1663772773669 has 2 divisors, whose sum is σ = 1663772773670. Its totient is φ = 1663772773668.

The previous prime is 1663772773661. The next prime is 1663772773693. The reversal of 1663772773669 is 9663772773661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399813160769 + 263959612900 = 1183137^2 + 513770^2 .

It is an emirp because it is prime and its reverse (9663772773661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1663772773669 - 2³ = 1663772773661 is a prime.

It is a super-2 number, since 2×1663772773669² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1663772773598 and 1663772773607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663772773661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831886386834 + 831886386835.

It is an arithmetic number, because the mean of its divisors is an integer number (831886386835).

Almost surely, 2^{1663772773669} is an apocalyptic number.

It is an amenable number.

1663772773669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663772773669 is an equidigital number, since it uses as much as digits as its factorization.

1663772773669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504094752, while the sum is 70.

The spelling of 1663772773669 in words is "one trillion, six hundred sixty-three billion, seven hundred seventy-two million, seven hundred seventy-three thousand, six hundred sixty-nine".