1966685984051 has 2 divisors, whose sum is σ = 1966685984052. Its totient is φ = 1966685984050.

The previous prime is 1966685984047. The next prime is 1966685984063. The reversal of 1966685984051 is 1504895866691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1966685984051 - 2² = 1966685984047 is a prime.

It is a super-3 number, since 3×1966685984051³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1966685984551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983342992025 + 983342992026.

It is an arithmetic number, because the mean of its divisors is an integer number (983342992026).

Almost surely, 2^{1966685984051} is an apocalyptic number.

1966685984051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966685984051 is an equidigital number, since it uses as much as digits as its factorization.

1966685984051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111974400, while the sum is 68.

The spelling of 1966685984051 in words is "one trillion, nine hundred sixty-six billion, six hundred eighty-five million, nine hundred eighty-four thousand, fifty-one".