1966269643 has 16 divisors (see below), whose sum is σ = 2236681216. Its totient is φ = 1715605920.

The previous prime is 1966269619. The next prime is 1966269653. The reversal of 1966269643 is 3469626691.

It is a cyclic number.

It is not a de Polignac number, because 1966269643 - 2⁵ = 1966269611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966269653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39405 + ... + 74062.

It is an arithmetic number, because the mean of its divisors is an integer number (139792576).

Almost surely, 2^1966269643 is an apocalyptic number.

1966269643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1966269643 is a deficient number, since it is larger than the sum of its proper divisors (270411573).

1966269643 is a wasteful number, since it uses less digits than its factorization.

1966269643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113554.

The product of its digits is 2519424, while the sum is 52.

The square root of 1966269643 is about 44342.6391072972. The cubic root of 1966269643 is about 1252.7979231349.

The spelling of 1966269643 in words is "one billion, nine hundred sixty-six million, two hundred sixty-nine thousand, six hundred forty-three".