1966129258381 has 2 divisors, whose sum is σ = 1966129258382. Its totient is φ = 1966129258380.

The previous prime is 1966129258297. The next prime is 1966129258393. The reversal of 1966129258381 is 1838529216691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1327633972900 + 638495285481 = 1152230^2 + 799059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966129258381 - 2⁷ = 1966129258253 is a prime.

It is a super-2 number, since 2×1966129258381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966129255381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983064629190 + 983064629191.

It is an arithmetic number, because the mean of its divisors is an integer number (983064629191).

Almost surely, 2^{1966129258381} is an apocalyptic number.

It is an amenable number.

1966129258381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966129258381 is an equidigital number, since it uses as much as digits as its factorization.

1966129258381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11197440, while the sum is 61.

The spelling of 1966129258381 in words is "one trillion, nine hundred sixty-six billion, one hundred twenty-nine million, two hundred fifty-eight thousand, three hundred eighty-one".