1920964666 has 8 divisors (see below), whose sum is σ = 2898103284. Its totient is φ = 954930240.

The previous prime is 1920964649. The next prime is 1920964667. The reversal of 1920964666 is 6664690291.

It can be written as a sum of positive squares in 2 ways, for example, as 1890945225 + 30019441 = 43485^2 + 5479^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1920964667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2775615 + ... + 2776306.

Almost surely, 2^1920964666 is an apocalyptic number.

1920964666 is a deficient number, since it is larger than the sum of its proper divisors (977138618).

1920964666 is a wasteful number, since it uses less digits than its factorization.

1920964666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5552096.

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 1920964666 is about 43828.8109124580. The cubic root of 1920964666 is about 1243.1011231934.

The spelling of 1920964666 in words is "one billion, nine hundred twenty million, nine hundred sixty-four thousand, six hundred sixty-six".