66075311577493 has 2 divisors, whose sum is σ = 66075311577494. Its totient is φ = 66075311577492.

The previous prime is 66075311577433. The next prime is 66075311577571. The reversal of 66075311577493 is 39477511357066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61419305680209 + 4656005897284 = 7837047^2 + 2157778^2 .

It is a cyclic number.

It is not a de Polignac number, because 66075311577493 - 2⁴¹ = 63876288321941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66075311577403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33037655788746 + 33037655788747.

It is an arithmetic number, because the mean of its divisors is an integer number (33037655788747).

Almost surely, 2^{66075311577493} is an apocalyptic number.

It is an amenable number.

66075311577493 is a deficient number, since it is larger than the sum of its proper divisors (1).

66075311577493 is an equidigital number, since it uses as much as digits as its factorization.

66075311577493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100018800, while the sum is 64.

The spelling of 66075311577493 in words is "sixty-six trillion, seventy-five billion, three hundred eleven million, five hundred seventy-seven thousand, four hundred ninety-three".