63618985 has 4 divisors (see below), whose sum is σ = 76342788. Its totient is φ = 50895184.

The previous prime is 63618959. The next prime is 63619067. The reversal of 63618985 is 58981636.

63618985 = T₆₅₁₁ + T₆₅₁₂ + T₆₅₁₃.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28761769 + 34857216 = 5363^2 + 5904^2 .

It is a cyclic number.

It is not a de Polignac number, because 63618985 - 2⁷ = 63618857 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6361894 + ... + 6361903.

It is an arithmetic number, because the mean of its divisors is an integer number (19085697).

Almost surely, 2^63618985 is an apocalyptic number.

63618985 is the 6513-rd centered triangular number.

It is an amenable number.

63618985 is a deficient number, since it is larger than the sum of its proper divisors (12723803).

63618985 is a wasteful number, since it uses less digits than its factorization.

63618985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12723802.

The product of its digits is 311040, while the sum is 46.

The square root of 63618985 is about 7976.1510141170. The cubic root of 63618985 is about 399.2046382976.

The spelling of 63618985 in words is "sixty-three million, six hundred eighteen thousand, nine hundred eighty-five".