65136563668 has 36 divisors (see below), whose sum is σ = 125319299476. Its totient is φ = 29601475200.

The previous prime is 65136563603. The next prime is 65136563669. The reversal of 65136563668 is 86636563156.

It is a happy number.

65136563668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7357865284 + 57778698384 = 85778^2 + 240372^2 .

It is a super-2 number, since 2×65136563668² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65136563669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3068146 + ... + 3089302.

Almost surely, 2^65136563668 is an apocalyptic number.

It is an amenable number.

65136563668 is a deficient number, since it is larger than the sum of its proper divisors (60182735808).

65136563668 is a wasteful number, since it uses less digits than its factorization.

65136563668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27544 (or 27531 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 55.

The spelling of 65136563668 in words is "sixty-five billion, one hundred thirty-six million, five hundred sixty-three thousand, six hundred sixty-eight".