66542201461 has 2 divisors, whose sum is σ = 66542201462. Its totient is φ = 66542201460.

The previous prime is 66542201441. The next prime is 66542201497. The reversal of 66542201461 is 16410224566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55368443025 + 11173758436 = 235305^2 + 105706^2 .

It is a cyclic number.

It is not a de Polignac number, because 66542201461 - 2⁷ = 66542201333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66542201461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66542201441) 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, 33271100730 + 33271100731.

It is an arithmetic number, because the mean of its divisors is an integer number (33271100731).

Almost surely, 2^66542201461 is an apocalyptic number.

It is an amenable number.

66542201461 is a deficient number, since it is larger than the sum of its proper divisors (1).

66542201461 is an equidigital number, since it uses as much as digits as its factorization.

66542201461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 66542201461 in words is "sixty-six billion, five hundred forty-two million, two hundred one thousand, four hundred sixty-one".