6604287661 has 4 divisors (see below), whose sum is σ = 6716224800. Its totient is φ = 6492350524.

The previous prime is 6604287659. The next prime is 6604287719. The reversal of 6604287661 is 1667824066.

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 a cyclic number.

It is not a de Polignac number, because 6604287661 - 2¹ = 6604287659 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 (6604287601) 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, 55968481 + ... + 55968598.

It is an arithmetic number, because the mean of its divisors is an integer number (1679056200).

Almost surely, 2^6604287661 is an apocalyptic number.

It is an amenable number.

6604287661 is a deficient number, since it is larger than the sum of its proper divisors (111937139).

6604287661 is a wasteful number, since it uses less digits than its factorization.

6604287661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111937138.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 6604287661 is about 81266.7684911859. The cubic root of 6604287661 is about 1876.1835642979.

The spelling of 6604287661 in words is "six billion, six hundred four million, two hundred eighty-seven thousand, six hundred sixty-one".