65551616666 has 4 divisors (see below), whose sum is σ = 98327425002. Its totient is φ = 32775808332.

The previous prime is 65551616651. The next prime is 65551616677. The reversal of 65551616666 is 66661615556.

It is a happy number.

65551616666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65525248441 + 26368225 = 255979^2 + 5135^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16387904165 + ... + 16387904168.

Almost surely, 2^65551616666 is an apocalyptic number.

65551616666 is a deficient number, since it is larger than the sum of its proper divisors (32775808336).

65551616666 is a wasteful number, since it uses less digits than its factorization.

65551616666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32775808335.

The product of its digits is 5832000, while the sum is 53.

The spelling of 65551616666 in words is "sixty-five billion, five hundred fifty-one million, six hundred sixteen thousand, six hundred sixty-six".