661600506 has 16 divisors (see below), whose sum is σ = 1512229824. Its totient is φ = 189028704.

The previous prime is 661600439. The next prime is 661600523. The reversal of 661600506 is 605006166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7876155 + ... + 7876238.

It is an arithmetic number, because the mean of its divisors is an integer number (94514364).

Almost surely, 2^661600506 is an apocalyptic number.

661600506 is an abundant number, since it is smaller than the sum of its proper divisors (850629318).

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

661600506 is a wasteful number, since it uses less digits than its factorization.

661600506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15752405.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 661600506 is about 25721.5961013309. The cubic root of 661600506 is about 871.3619861308.

The spelling of 661600506 in words is "six hundred sixty-one million, six hundred thousand, five hundred six".