1966700921 has 2 divisors, whose sum is σ = 1966700922. Its totient is φ = 1966700920.

The previous prime is 1966700909. The next prime is 1966700927. The reversal of 1966700921 is 1290076691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1833552400 + 133148521 = 42820^2 + 11539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966700921 - 2¹⁰ = 1966699897 is a prime.

It is a super-3 number, since 3×1966700921³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1966700927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983350460 + 983350461.

It is an arithmetic number, because the mean of its divisors is an integer number (983350461).

Almost surely, 2^1966700921 is an apocalyptic number.

It is an amenable number.

1966700921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966700921 is an equidigital number, since it uses as much as digits as its factorization.

1966700921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 1966700921 is about 44347.5018574891. The cubic root of 1966700921 is about 1252.8895119100.

The spelling of 1966700921 in words is "one billion, nine hundred sixty-six million, seven hundred thousand, nine hundred twenty-one".