65621542216 has 8 divisors (see below), whose sum is σ = 123040391670. Its totient is φ = 32810771104.

The previous prime is 65621542199. The next prime is 65621542241. The reversal of 65621542216 is 61224512656.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 38827126116 + 26794416100 = 197046^2 + 163690^2 .

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

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4101346381 + ... + 4101346396.

Almost surely, 2^65621542216 is an apocalyptic number.

It is an amenable number.

65621542216 is a deficient number, since it is larger than the sum of its proper divisors (57418849454).

65621542216 is a wasteful number, since it uses less digits than its factorization.

65621542216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8202692783 (or 8202692779 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The spelling of 65621542216 in words is "sixty-five billion, six hundred twenty-one million, five hundred forty-two thousand, two hundred sixteen".