66278068712222 has 4 divisors (see below), whose sum is σ = 99417103068336. Its totient is φ = 33139034356110.

The previous prime is 66278068712161. The next prime is 66278068712249. The reversal of 66278068712222 is 22221786087266.

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

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, 16569517178054 + ... + 16569517178057.

It is an arithmetic number, because the mean of its divisors is an integer number (24854275767084).

Almost surely, 2^{66278068712222} is an apocalyptic number.

66278068712222 is a deficient number, since it is larger than the sum of its proper divisors (33139034356114).

66278068712222 is a wasteful number, since it uses less digits than its factorization.

66278068712222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33139034356113.

The product of its (nonzero) digits is 21676032, while the sum is 59.

The spelling of 66278068712222 in words is "sixty-six trillion, two hundred seventy-eight billion, sixty-eight million, seven hundred twelve thousand, two hundred twenty-two".