665429638 has 8 divisors (see below), whose sum is σ = 998339760. Its totient is φ = 332649720.

The previous prime is 665429579. The next prime is 665429651. The reversal of 665429638 is 836924566.

665429638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×665429638² = 885593206257622088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665429591 and 665429600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18573 + ... + 40936.

It is an arithmetic number, because the mean of its divisors is an integer number (124792470).

Almost surely, 2^665429638 is an apocalyptic number.

665429638 is a deficient number, since it is larger than the sum of its proper divisors (332910122).

665429638 is a wasteful number, since it uses less digits than its factorization.

665429638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65102.

The product of its digits is 1866240, while the sum is 49.

The square root of 665429638 is about 25795.9228949072. The cubic root of 665429638 is about 873.0398081557.

The spelling of 665429638 in words is "six hundred sixty-five million, four hundred twenty-nine thousand, six hundred thirty-eight".