663226185769 has 9 divisors (see below), whose sum is σ = 771514643511. Its totient is φ = 568474701480.

The previous prime is 663226185767. The next prime is 663226185773. The reversal of 663226185769 is 967581622366.

The square root of 663226185769 is 814387.

It is a perfect power (a square), and thus also a powerful number.

663226185769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 491382774169 + 171843411600 = 700987^2 + 414540^2 .

It is not a de Polignac number, because 663226185769 - 2¹ = 663226185767 is a prime.

It is a super-2 number, since 2×663226185769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663226185767) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5642539 + ... + 5758879.

It is an arithmetic number, because the mean of its divisors is an integer number (85723849279).

Almost surely, 2^663226185769 is an apocalyptic number.

663226185769 is the 814387-th square number.

663226185769 is the 407194-th centered octagonal number.

It is an amenable number.

663226185769 is a deficient number, since it is larger than the sum of its proper divisors (108288457742).

663226185769 is an frugal number, since it uses more digits than its factorization.

663226185769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232696 (or 116348 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 61.

The spelling of 663226185769 in words is "six hundred sixty-three billion, two hundred twenty-six million, one hundred eighty-five thousand, seven hundred sixty-nine".