65521612556 has 24 divisors (see below), whose sum is σ = 122676366960. Its totient is φ = 30527755200.

The previous prime is 65521612553. The next prime is 65521612589.

65521612556 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (65521612553) 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, 7061975 + ... + 7071246.

It is an arithmetic number, because the mean of its divisors is an integer number (5111515290).

Almost surely, 2^65521612556 is an apocalyptic number.

It is an amenable number.

65521612556 is a deficient number, since it is larger than the sum of its proper divisors (57154754404).

65521612556 is a wasteful number, since it uses less digits than its factorization.

65521612556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14133305 (or 14133303 counting only the distinct ones).

The product of its digits is 540000, while the sum is 44.

The spelling of 65521612556 in words is "sixty-five billion, five hundred twenty-one million, six hundred twelve thousand, five hundred fifty-six".