66547772216 has 8 divisors (see below), whose sum is σ = 124777072920. Its totient is φ = 33273886104.

The previous prime is 66547772197. The next prime is 66547772267. The reversal of 66547772216 is 61227774566.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4159235756 + ... + 4159235771.

It is an arithmetic number, because the mean of its divisors is an integer number (15597134115).

Almost surely, 2^66547772216 is an apocalyptic number.

It is an amenable number.

66547772216 is a deficient number, since it is larger than the sum of its proper divisors (58229300704).

66547772216 is a wasteful number, since it uses less digits than its factorization.

66547772216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8318471533 (or 8318471529 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 53.

The spelling of 66547772216 in words is "sixty-six billion, five hundred forty-seven million, seven hundred seventy-two thousand, two hundred sixteen".