665623430 has 16 divisors (see below), whose sum is σ = 1198809504. Its totient is φ = 266096640.

The previous prime is 665623393. The next prime is 665623463. The reversal of 665623430 is 34326566.

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, 134 + ... + 36486.

It is an arithmetic number, because the mean of its divisors is an integer number (74925594).

Almost surely, 2^665623430 is an apocalyptic number.

665623430 is a deficient number, since it is larger than the sum of its proper divisors (533186074).

665623430 is a wasteful number, since it uses less digits than its factorization.

665623430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38191.

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 665623430 is about 25799.6788739705. The cubic root of 665623430 is about 873.1245512547.

Adding to 665623430 its reverse (34326566), we get a palindrome (699949996).

The spelling of 665623430 in words is "six hundred sixty-five million, six hundred twenty-three thousand, four hundred thirty".