661623008 has 12 divisors (see below), whose sum is σ = 1302570360. Its totient is φ = 330811488.

The previous prime is 661622989. The next prime is 661623013. The reversal of 661623008 is 800326166.

661623008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 20675719 = 661623008 / (6 + 6 + 1 + 6 + 2 + 3 + 0 + 0 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10337828 + ... + 10337891.

It is an arithmetic number, because the mean of its divisors is an integer number (108547530).

Almost surely, 2^661623008 is an apocalyptic number.

It is an amenable number.

661623008 is a deficient number, since it is larger than the sum of its proper divisors (640947352).

661623008 is a wasteful number, since it uses less digits than its factorization.

661623008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20675729 (or 20675721 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 661623008 is about 25722.0335121467. The cubic root of 661623008 is about 871.3718647837.

The spelling of 661623008 in words is "six hundred sixty-one million, six hundred twenty-three thousand, eight".