661600502 has 4 divisors (see below), whose sum is σ = 992400756. Its totient is φ = 330800250.

The previous prime is 661600439. The next prime is 661600523. The reversal of 661600502 is 205006166.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 165400124 + ... + 165400127.

It is an arithmetic number, because the mean of its divisors is an integer number (248100189).

Almost surely, 2^661600502 is an apocalyptic number.

661600502 is a deficient number, since it is larger than the sum of its proper divisors (330800254).

661600502 is a wasteful number, since it uses less digits than its factorization.

661600502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330800253.

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

The square root of 661600502 is about 25721.5960235752. The cubic root of 661600502 is about 871.3619843748.

Adding to 661600502 its reverse (205006166), we get a palindrome (866606668).

The spelling of 661600502 in words is "six hundred sixty-one million, six hundred thousand, five hundred two".