66154541393 has 2 divisors, whose sum is σ = 66154541394. Its totient is φ = 66154541392.

The previous prime is 66154541333. The next prime is 66154541413. The reversal of 66154541393 is 39314545166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39980802304 + 26173739089 = 199952^2 + 161783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66154541393 is a prime.

It is not a weakly prime, because it can be changed into another prime (66154541333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33077270696 + 33077270697.

It is an arithmetic number, because the mean of its divisors is an integer number (33077270697).

Almost surely, 2^66154541393 is an apocalyptic number.

It is an amenable number.

66154541393 is a deficient number, since it is larger than the sum of its proper divisors (1).

66154541393 is an equidigital number, since it uses as much as digits as its factorization.

66154541393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 47.

The spelling of 66154541393 in words is "sixty-six billion, one hundred fifty-four million, five hundred forty-one thousand, three hundred ninety-three".