669027479481 has 27 divisors (see below), whose sum is σ = 987541861423. Its totient is φ = 436453317600.

The previous prime is 669027479459. The next prime is 669027479597. The reversal of 669027479481 is 184974720966.

The square root of 669027479481 is 817941.

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

669027479481 is a `hidden beast` number, since 6 + 6 + 90 + 27 + 47 + 9 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 657544213881 + 11483265600 = 810891^2 + 107160^2 .

It is not a de Polignac number, because 669027479481 - 2¹⁹ = 669026955193 is a prime.

It is a super-2 number, since 2×669027479481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (669027479431) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 115326781 + ... + 115332581.

Almost surely, 2^669027479481 is an apocalyptic number.

669027479481 is the 817941-st square number.

669027479481 is the 408971-st centered octagonal number.

It is an amenable number.

669027479481 is a deficient number, since it is larger than the sum of its proper divisors (318514381942).

669027479481 is an frugal number, since it uses more digits than its factorization.

669027479481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11702 (or 5851 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 63.

The spelling of 669027479481 in words is "six hundred sixty-nine billion, twenty-seven million, four hundred seventy-nine thousand, four hundred eighty-one".