65551211215556 has 18 divisors (see below), whose sum is σ = 126091276120110. Its totient is φ = 29796005097760.

The previous prime is 65551211215543. The next prime is 65551211215603.

65551211215556 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 41927567522500 + 23623643693056 = 6475150^2 + 4860416^2 .

It is a super-2 number, since 2×65551211215556² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67718192921 + ... + 67718193888.

Almost surely, 2^{65551211215556} is an apocalyptic number.

It is an amenable number.

65551211215556 is a deficient number, since it is larger than the sum of its proper divisors (60540064904554).

65551211215556 is a wasteful number, since it uses less digits than its factorization.

65551211215556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135436386835 (or 135436386822 counting only the distinct ones).

The product of its digits is 2250000, while the sum is 50.

The spelling of 65551211215556 in words is "sixty-five trillion, five hundred fifty-one billion, two hundred eleven million, two hundred fifteen thousand, five hundred fifty-six".