65512121064 has 32 divisors (see below), whose sum is σ = 176378788320. Its totient is φ = 20157575616.

The previous prime is 65512121023. The next prime is 65512121069. The reversal of 65512121064 is 46012121556.

It is not an unprimeable number, because it can be changed into a prime (65512121069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104987062 + ... + 104987685.

It is an arithmetic number, because the mean of its divisors is an integer number (5511837135).

Almost surely, 2^65512121064 is an apocalyptic number.

It is an amenable number.

65512121064 is an abundant number, since it is smaller than the sum of its proper divisors (110866667256).

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

65512121064 is a wasteful number, since it uses less digits than its factorization.

65512121064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209974769 (or 209974765 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 65512121064 in words is "sixty-five billion, five hundred twelve million, one hundred twenty-one thousand, sixty-four".