66547225718 has 4 divisors (see below), whose sum is σ = 99820838580. Its totient is φ = 33273612858.

The previous prime is 66547225711. The next prime is 66547225727. The reversal of 66547225718 is 81752274566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81752274566 = 2 ⋅40876137283.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66547225718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66547225711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16636806428 + ... + 16636806431.

It is an arithmetic number, because the mean of its divisors is an integer number (24955209645).

Almost surely, 2^66547225718 is an apocalyptic number.

66547225718 is a deficient number, since it is larger than the sum of its proper divisors (33273612862).

66547225718 is a wasteful number, since it uses less digits than its factorization.

66547225718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33273612861.

The product of its digits is 5644800, while the sum is 53.

The spelling of 66547225718 in words is "sixty-six billion, five hundred forty-seven million, two hundred twenty-five thousand, seven hundred eighteen".