661505502 has 16 divisors (see below), whose sum is σ = 1512012672. Its totient is φ = 189001560.

The previous prime is 661505447. The next prime is 661505543. The reversal of 661505502 is 205505166.

It is a self number, because there is not a number n which added to its sum of digits gives 661505502.

It is a congruent number.

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, 7875024 + ... + 7875107.

It is an arithmetic number, because the mean of its divisors is an integer number (94500792).

Almost surely, 2^661505502 is an apocalyptic number.

661505502 is an abundant number, since it is smaller than the sum of its proper divisors (850507170).

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

661505502 is a wasteful number, since it uses less digits than its factorization.

661505502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15750143.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 661505502 is about 25719.7492600531. The cubic root of 661505502 is about 871.3202757451.

The spelling of 661505502 in words is "six hundred sixty-one million, five hundred five thousand, five hundred two".