661600599 has 8 divisors (see below), whose sum is σ = 962328192. Its totient is φ = 400970040.

The previous prime is 661600591. The next prime is 661600607. The reversal of 661600599 is 995006166.

It is an interprime number because it is at equal distance from previous prime (661600591) and next prime (661600607).

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

It is not a de Polignac number, because 661600599 - 2³ = 661600591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661600599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661600591) by changing a digit.

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, 10024219 + ... + 10024284.

It is an arithmetic number, because the mean of its divisors is an integer number (120291024).

Almost surely, 2^661600599 is an apocalyptic number.

661600599 is a deficient number, since it is larger than the sum of its proper divisors (300727593).

661600599 is a wasteful number, since it uses less digits than its factorization.

661600599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20048517.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 661600599 is about 25721.5979091502. The cubic root of 661600599 is about 871.3620269594.

The spelling of 661600599 in words is "six hundred sixty-one million, six hundred thousand, five hundred ninety-nine".