1966966801 has 2 divisors, whose sum is σ = 1966966802. Its totient is φ = 1966966800.

The previous prime is 1966966733. The next prime is 1966966843. The reversal of 1966966801 is 1086696691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1672810000 + 294156801 = 40900^2 + 17151^2 .

It is an emirp because it is prime and its reverse (1086696691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966966801 - 2²⁹ = 1430095889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1966966871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983483400 + 983483401.

It is an arithmetic number, because the mean of its divisors is an integer number (983483401).

Almost surely, 2^1966966801 is an apocalyptic number.

It is an amenable number.

1966966801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966966801 is an equidigital number, since it uses as much as digits as its factorization.

1966966801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 1966966801 is about 44350.4994447639. The cubic root of 1966966801 is about 1252.9459691051.

The spelling of 1966966801 in words is "one billion, nine hundred sixty-six million, nine hundred sixty-six thousand, eight hundred one".