65421212456 has 8 divisors (see below), whose sum is σ = 122664773370. Its totient is φ = 32710606224.

The previous prime is 65421212453. The next prime is 65421212501.

65421212456 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 41479839556 + 23941372900 = 203666^2 + 154730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (65421212453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4088825771 + ... + 4088825786.

Almost surely, 2^65421212456 is an apocalyptic number.

It is an amenable number.

65421212456 is a deficient number, since it is larger than the sum of its proper divisors (57243560914).

65421212456 is a wasteful number, since it uses less digits than its factorization.

65421212456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8177651563 (or 8177651559 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The spelling of 65421212456 in words is "sixty-five billion, four hundred twenty-one million, two hundred twelve thousand, four hundred fifty-six".