66424640361 has 4 divisors (see below), whose sum is σ = 88566187152. Its totient is φ = 44283093572.

The previous prime is 66424640309. The next prime is 66424640369. The reversal of 66424640361 is 16304642466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66424640361 - 2¹⁴ = 66424623977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66424640369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11070773391 + ... + 11070773396.

It is an arithmetic number, because the mean of its divisors is an integer number (22141546788).

Almost surely, 2^66424640361 is an apocalyptic number.

It is an amenable number.

66424640361 is a deficient number, since it is larger than the sum of its proper divisors (22141546791).

66424640361 is a wasteful number, since it uses less digits than its factorization.

66424640361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22141546790.

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 66424640361 in words is "sixty-six billion, four hundred twenty-four million, six hundred forty thousand, three hundred sixty-one".