557007661 has 4 divisors (see below), whose sum is σ = 636580192. Its totient is φ = 477435132.

The previous prime is 557007643. The next prime is 557007679. The reversal of 557007661 is 166700755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (557007643) and next prime (557007679).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557007661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 557007661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557007631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39786255 + ... + 39786268.

It is an arithmetic number, because the mean of its divisors is an integer number (159145048).

Almost surely, 2^557007661 is an apocalyptic number.

It is an amenable number.

557007661 is a deficient number, since it is larger than the sum of its proper divisors (79572531).

557007661 is an equidigital number, since it uses as much as digits as its factorization.

557007661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79572530.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 557007661 is about 23601.0097453478. The cubic root of 557007661 is about 822.7863083105.

The spelling of 557007661 in words is "five hundred fifty-seven million, seven thousand, six hundred sixty-one".