63894189529 has 9 divisors (see below), whose sum is σ = 67878323517. Its totient is φ = 60131663424.

The previous prime is 63894189521. The next prime is 63894189551. The reversal of 63894189529 is 92598149836.

The square root of 63894189529 is 252773.

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

It can be written as a sum of positive squares in 4 ways, for example, as 12638025 + 63881551504 = 3555^2 + 252748^2 .

It is not a de Polignac number, because 63894189529 - 2³ = 63894189521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63894189521) 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, 4289707 + ... + 4304575.

Almost surely, 2^63894189529 is an apocalyptic number.

63894189529 is the 252773-rd square number.

63894189529 is the 126387-th centered octagonal number.

It is an amenable number.

63894189529 is a deficient number, since it is larger than the sum of its proper divisors (3984133988).

63894189529 is an frugal number, since it uses more digits than its factorization.

63894189529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29772 (or 14886 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 64.

Multiplying 63894189529 by its sum of digits (64), we get a square (4089228129856 = 2022184²).

The spelling of 63894189529 in words is "sixty-three billion, eight hundred ninety-four million, one hundred eighty-nine thousand, five hundred twenty-nine".