665922849 has 32 divisors (see below), whose sum is σ = 956743680. Its totient is φ = 410743872.

The previous prime is 665922839. The next prime is 665922871. The reversal of 665922849 is 948229566.

It is not a de Polignac number, because 665922849 - 2⁴ = 665922833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (665922839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 484327 + ... + 485699.

It is an arithmetic number, because the mean of its divisors is an integer number (29898240).

Almost surely, 2^665922849 is an apocalyptic number.

It is an amenable number.

665922849 is a deficient number, since it is larger than the sum of its proper divisors (290820831).

665922849 is a wasteful number, since it uses less digits than its factorization.

665922849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589.

The product of its digits is 1866240, while the sum is 51.

The square root of 665922849 is about 25805.4809875732. The cubic root of 665922849 is about 873.2554515396.

The spelling of 665922849 in words is "six hundred sixty-five million, nine hundred twenty-two thousand, eight hundred forty-nine".