1966865703757 has 2 divisors, whose sum is σ = 1966865703758. Its totient is φ = 1966865703756.

The previous prime is 1966865703701. The next prime is 1966865703767. The reversal of 1966865703757 is 7573075686691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677734735076 + 289130968681 = 1295274^2 + 537709^2 .

It is an emirp because it is prime and its reverse (7573075686691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966865703757 - 2¹⁹ = 1966865179469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966865703767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983432851878 + 983432851879.

It is an arithmetic number, because the mean of its divisors is an integer number (983432851879).

Almost surely, 2^{1966865703757} is an apocalyptic number.

It is an amenable number.

1966865703757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966865703757 is an equidigital number, since it uses as much as digits as its factorization.

1966865703757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400075200, while the sum is 70.

The spelling of 1966865703757 in words is "one trillion, nine hundred sixty-six billion, eight hundred sixty-five million, seven hundred three thousand, seven hundred fifty-seven".