661309006 has 8 divisors (see below), whose sum is σ = 1001234520. Its totient is φ = 327564168.

The previous prime is 661308979. The next prime is 661309013. The reversal of 661309006 is 600903166.

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

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, 1544901 + ... + 1545328.

It is an arithmetic number, because the mean of its divisors is an integer number (125154315).

Almost surely, 2^661309006 is an apocalyptic number.

661309006 is a deficient number, since it is larger than the sum of its proper divisors (339925514).

661309006 is a wasteful number, since it uses less digits than its factorization.

661309006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090338.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 661309006 is about 25715.9290324110. The cubic root of 661309006 is about 871.2339938202.

The spelling of 661309006 in words is "six hundred sixty-one million, three hundred nine thousand, six".