63486585815409 has 9 divisors (see below), whose sum is σ = 91702880705163. Its totient is φ = 42324374607912.

The previous prime is 63486585815407. The next prime is 63486585815431. The reversal of 63486585815409 is 90451858568436.

The square root of 63486585815409 is 7967847.

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

63486585815409 is a `hidden beast` number, since 6 + 3 + 4 + 8 + 65 + 85 + 81 + 5 + 409 = 666.

It can be written as a sum of positive squares in only one way, i.e., 59902909651809 + 3583676163600 = 7739697^2 + 1893060^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 63486585815409 - 2¹ = 63486585815407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63486585815407) 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, 22575567 + ... + 25231515.

Almost surely, 2^{63486585815409} is an apocalyptic number.

63486585815409 is the 7967847-th square number.

63486585815409 is the 3983924-th centered octagonal number.

It is an amenable number.

63486585815409 is a deficient number, since it is larger than the sum of its proper divisors (28216294889754).

63486585815409 is an frugal number, since it uses more digits than its factorization.

63486585815409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5311904 (or 2655952 counting only the distinct ones).

The product of its (nonzero) digits is 995328000, while the sum is 72.

The spelling of 63486585815409 in words is "sixty-three trillion, four hundred eighty-six billion, five hundred eighty-five million, eight hundred fifteen thousand, four hundred nine".