63661351986 has 48 divisors (see below), whose sum is σ = 142756473600. Its totient is φ = 20479056864.

The previous prime is 63661351967. The next prime is 63661352039. The reversal of 63661351986 is 68915316636.

63661351986 is a `hidden beast` number, since 6 + 3 + 6 + 613 + 5 + 19 + 8 + 6 = 666.

It is a super-2 number, since 2×63661351986² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1124425 + ... + 1179683.

It is an arithmetic number, because the mean of its divisors is an integer number (2974093200).

Almost surely, 2^63661351986 is an apocalyptic number.

63661351986 is an abundant number, since it is smaller than the sum of its proper divisors (79095121614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63661351986 is a wasteful number, since it uses less digits than its factorization.

63661351986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57503 (or 57500 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The spelling of 63661351986 in words is "sixty-three billion, six hundred sixty-one million, three hundred fifty-one thousand, nine hundred eighty-six".