661502006 has 24 divisors (see below), whose sum is σ = 1121102424. Its totient is φ = 290306240.

The previous prime is 661501993. The next prime is 661502047. The reversal of 661502006 is 600205166.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 626 + ... + 36378.

It is an arithmetic number, because the mean of its divisors is an integer number (46712601).

Almost surely, 2^661502006 is an apocalyptic number.

661502006 is a deficient number, since it is larger than the sum of its proper divisors (459600418).

661502006 is a wasteful number, since it uses less digits than its factorization.

661502006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35824 (or 35795 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 661502006 is about 25719.6812966257. The cubic root of 661502006 is about 871.3187407914.

The spelling of 661502006 in words is "six hundred sixty-one million, five hundred two thousand, six".