665846438 has 16 divisors (see below), whose sum is σ = 1038420000. Its totient is φ = 319822272.

The previous prime is 665846383. The next prime is 665846479. The reversal of 665846438 is 834648566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17303 + ... + 40386.

It is an arithmetic number, because the mean of its divisors is an integer number (64901250).

Almost surely, 2^665846438 is an apocalyptic number.

665846438 is a deficient number, since it is larger than the sum of its proper divisors (372573562).

665846438 is a wasteful number, since it uses less digits than its factorization.

665846438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57919.

The product of its digits is 3317760, while the sum is 50.

The square root of 665846438 is about 25804.0004262905. Note that the first 3 decimals coincide. The cubic root of 665846438 is about 873.2220498351. Note that the first 3 decimals are identical.

The spelling of 665846438 in words is "six hundred sixty-five million, eight hundred forty-six thousand, four hundred thirty-eight".