65521663052304 has 20 divisors (see below), whose sum is σ = 169264296218576. Its totient is φ = 21840554350752.

The previous prime is 65521663052221. The next prime is 65521663052323. The reversal of 65521663052304 is 40325036612556.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1365034646923 = 65521663052304 / (6 + 5 + 5 + 2 + 1 + 6 + 6 + 3 + 0 + 5 + 2 + 3 + 0 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682517323414 + ... + 682517323509.

Almost surely, 2^{65521663052304} is an apocalyptic number.

It is an amenable number.

65521663052304 is an abundant number, since it is smaller than the sum of its proper divisors (103742633166272).

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

65521663052304 is a wasteful number, since it uses less digits than its factorization.

65521663052304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365034646934 (or 1365034646928 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 65521663052304 in words is "sixty-five trillion, five hundred twenty-one billion, six hundred sixty-three million, fifty-two thousand, three hundred four".