66146214919693 has 2 divisors, whose sum is σ = 66146214919694. Its totient is φ = 66146214919692.

The previous prime is 66146214919679. The next prime is 66146214919709. The reversal of 66146214919693 is 39691941264166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56212611215049 + 9933603704644 = 7497507^2 + 3151762^2 .

It is a cyclic number.

It is not a de Polignac number, because 66146214919693 - 2²⁹ = 66145678048781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66146214919493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33073107459846 + 33073107459847.

It is an arithmetic number, because the mean of its divisors is an integer number (33073107459847).

Almost surely, 2^{66146214919693} is an apocalyptic number.

It is an amenable number.

66146214919693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66146214919693 is an equidigital number, since it uses as much as digits as its factorization.

66146214919693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90699264, while the sum is 67.

The spelling of 66146214919693 in words is "sixty-six trillion, one hundred forty-six billion, two hundred fourteen million, nine hundred nineteen thousand, six hundred ninety-three".