66605181224387 has 4 divisors (see below), whose sum is σ = 71728656703200. Its totient is φ = 61481705745576.

The previous prime is 66605181224371. The next prime is 66605181224401. The reversal of 66605181224387 is 78342218150666.

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

It is a cyclic number.

It is not a de Polignac number, because 66605181224387 - 2⁴ = 66605181224371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66605081224387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561737739387 + ... + 2561737739412.

It is an arithmetic number, because the mean of its divisors is an integer number (17932164175800).

Almost surely, 2^{66605181224387} is an apocalyptic number.

66605181224387 is a deficient number, since it is larger than the sum of its proper divisors (5123475478813).

66605181224387 is a wasteful number, since it uses less digits than its factorization.

66605181224387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123475478812.

The product of its (nonzero) digits is 23224320, while the sum is 59.

The spelling of 66605181224387 in words is "sixty-six trillion, six hundred five billion, one hundred eighty-one million, two hundred twenty-four thousand, three hundred eighty-seven".