1966370809 has 16 divisors (see below), whose sum is σ = 2269435392. Its totient is φ = 1689259968.

The previous prime is 1966370797. The next prime is 1966370831. The reversal of 1966370809 is 9080736691.

It is a cyclic number.

It is not a de Polignac number, because 1966370809 - 2¹³ = 1966362617 is a prime.

It is a super-2 number, since 2×1966370809² = 7733228316974628962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1966370849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77809 + ... + 99934.

It is an arithmetic number, because the mean of its divisors is an integer number (141839712).

Almost surely, 2^1966370809 is an apocalyptic number.

It is an amenable number.

1966370809 is a deficient number, since it is larger than the sum of its proper divisors (303064583).

1966370809 is a wasteful number, since it uses less digits than its factorization.

1966370809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177816.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 1966370809 is about 44343.7798231048. The cubic root of 1966370809 is about 1252.8194085538.

The spelling of 1966370809 in words is "one billion, nine hundred sixty-six million, three hundred seventy thousand, eight hundred nine".