661307008 has 32 divisors (see below), whose sum is σ = 1386792000. Its totient is φ = 313249536.

The previous prime is 661306991. The next prime is 661307029. The reversal of 661307008 is 800703166.

661307008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

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, 133528 + ... + 138391.

It is an arithmetic number, because the mean of its divisors is an integer number (43337250).

Almost surely, 2^661307008 is an apocalyptic number.

It is an amenable number.

661307008 is an abundant number, since it is smaller than the sum of its proper divisors (725484992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661307008 is a wasteful number, since it uses less digits than its factorization.

661307008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271952 (or 271940 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 661307008 is about 25715.8901848643. The cubic root of 661307008 is about 871.2331164053.

The spelling of 661307008 in words is "six hundred sixty-one million, three hundred seven thousand, eight".