66620157389 has 2 divisors, whose sum is σ = 66620157390. Its totient is φ = 66620157388.

The previous prime is 66620157343. The next prime is 66620157451. The reversal of 66620157389 is 98375102666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66606834889 + 13322500 = 258083^2 + 3650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66620157389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66620157389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66620157689) 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 as a sum of consecutive naturals, namely, 33310078694 + 33310078695.

It is an arithmetic number, because the mean of its divisors is an integer number (33310078695).

Almost surely, 2^66620157389 is an apocalyptic number.

It is an amenable number.

66620157389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66620157389 is an equidigital number, since it uses as much as digits as its factorization.

66620157389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 66620157389 in words is "sixty-six billion, six hundred twenty million, one hundred fifty-seven thousand, three hundred eighty-nine".