320435665666 has 4 divisors (see below), whose sum is σ = 480653498502. Its totient is φ = 160217832832.

The previous prime is 320435665663. The next prime is 320435665777. The reversal of 320435665666 is 666566534023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 216709801441 + 103725864225 = 465521^2 + 322065^2 .

It is not an unprimeable number, because it can be changed into a prime (320435665661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80108916415 + ... + 80108916418.

Almost surely, 2^320435665666 is an apocalyptic number.

320435665666 is a deficient number, since it is larger than the sum of its proper divisors (160217832836).

320435665666 is a wasteful number, since it uses less digits than its factorization.

320435665666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160217832835.

The product of its (nonzero) digits is 13996800, while the sum is 52.

The spelling of 320435665666 in words is "three hundred twenty billion, four hundred thirty-five million, six hundred sixty-five thousand, six hundred sixty-six".