65220120511520 has 96 divisors (see below), whose sum is σ = 169793991968832. Its totient is φ = 23521245576192.

The previous prime is 65220120511451. The next prime is 65220120511549. The reversal of 65220120511520 is 2511502102256.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364513202 + ... + 364692081.

It is an arithmetic number, because the mean of its divisors is an integer number (1768687416342).

Almost surely, 2^{65220120511520} is an apocalyptic number.

It is an amenable number.

65220120511520 is an abundant number, since it is smaller than the sum of its proper divisors (104573871457312).

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

65220120511520 is a wasteful number, since it uses less digits than its factorization.

65220120511520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729205354 (or 729205346 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 65220120511520 its reverse (2511502102256), we get a palindrome (67731622613776).

The spelling of 65220120511520 in words is "sixty-five trillion, two hundred twenty billion, one hundred twenty million, five hundred eleven thousand, five hundred twenty".