661600583 has 4 divisors (see below), whose sum is σ = 756114960. Its totient is φ = 567086208.

The previous prime is 661600579. The next prime is 661600591. The reversal of 661600583 is 385006166.

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

It is a cyclic number.

It is not a de Polignac number, because 661600583 - 2² = 661600579 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661600523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47257178 + ... + 47257191.

It is an arithmetic number, because the mean of its divisors is an integer number (189028740).

Almost surely, 2^661600583 is an apocalyptic number.

661600583 is a deficient number, since it is larger than the sum of its proper divisors (94514377).

661600583 is an equidigital number, since it uses as much as digits as its factorization.

661600583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94514376.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 661600583 is about 25721.5975981275. The cubic root of 661600583 is about 871.3620199352.

The spelling of 661600583 in words is "six hundred sixty-one million, six hundred thousand, five hundred eighty-three".