665913829 has 4 divisors (see below), whose sum is σ = 761044384. Its totient is φ = 570783276.

The previous prime is 665913823. The next prime is 665913869. The reversal of 665913829 is 928319566.

665913829 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 665913829 - 2⁷ = 665913701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665913823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47565267 + ... + 47565280.

It is an arithmetic number, because the mean of its divisors is an integer number (190261096).

Almost surely, 2^665913829 is an apocalyptic number.

It is an amenable number.

665913829 is a deficient number, since it is larger than the sum of its proper divisors (95130555).

665913829 is an equidigital number, since it uses as much as digits as its factorization.

665913829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95130554.

The product of its digits is 699840, while the sum is 49.

The square root of 665913829 is about 25805.3062179080. The cubic root of 665913829 is about 873.2515087406.

The spelling of 665913829 in words is "six hundred sixty-five million, nine hundred thirteen thousand, eight hundred twenty-nine".