65601535520 has 24 divisors (see below), whose sum is σ = 154983628044. Its totient is φ = 26240614144.

The previous prime is 65601535481. The next prime is 65601535537. The reversal of 65601535520 is 2553510656.

It can be written as a sum of positive squares in 2 ways, for example, as 65255724304 + 345811216 = 255452^2 + 18596^2 .

It is a super-2 number, since 2×65601535520² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205004639 + ... + 205004958.

Almost surely, 2^65601535520 is an apocalyptic number.

It is an amenable number.

65601535520 is an abundant number, since it is smaller than the sum of its proper divisors (89382092524).

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

65601535520 is a wasteful number, since it uses less digits than its factorization.

65601535520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410009612 (or 410009604 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 65601535520 in words is "sixty-five billion, six hundred one million, five hundred thirty-five thousand, five hundred twenty".