1946664691 has 2 divisors, whose sum is σ = 1946664692. Its totient is φ = 1946664690.

The previous prime is 1946664677. The next prime is 1946664767. The reversal of 1946664691 is 1964666491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1946664691 - 2⁷ = 1946664563 is a prime.

It is a super-2 number, since 2×1946664691² = 7579006838372250962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1946664631) 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, 973332345 + 973332346.

It is an arithmetic number, because the mean of its divisors is an integer number (973332346).

Almost surely, 2^1946664691 is an apocalyptic number.

1946664691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1946664691 is an equidigital number, since it uses as much as digits as its factorization.

1946664691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 52.

The square root of 1946664691 is about 44121.0232315616. The cubic root of 1946664691 is about 1248.6202784016.

The spelling of 1946664691 in words is "one billion, nine hundred forty-six million, six hundred sixty-four thousand, six hundred ninety-one".