65563991986 has 8 divisors (see below), whose sum is σ = 98394226560. Its totient is φ = 32765916468.

The previous prime is 65563991951. The next prime is 65563991989. The reversal of 65563991986 is 68919936556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (65563991989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8034666 + ... + 8042821.

It is an arithmetic number, because the mean of its divisors is an integer number (12299278320).

Almost surely, 2^65563991986 is an apocalyptic number.

65563991986 is a deficient number, since it is larger than the sum of its proper divisors (32830234574).

65563991986 is a wasteful number, since it uses less digits than its factorization.

65563991986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16079528.

The product of its digits is 94478400, while the sum is 67.

The spelling of 65563991986 in words is "sixty-five billion, five hundred sixty-three million, nine hundred ninety-one thousand, nine hundred eighty-six".