6661357 has 4 divisors (see below), whose sum is σ = 6803136. Its totient is φ = 6519580.

The previous prime is 6661349. The next prime is 6661367. The reversal of 6661357 is 7531666.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7531666 = 2 ⋅3765833.

It is a cyclic number.

It is not a de Polignac number, because 6661357 - 2³ = 6661349 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 (6661307) 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, 70819 + ... + 70912.

It is an arithmetic number, because the mean of its divisors is an integer number (1700784).

Almost surely, 2^6661357 is an apocalyptic number.

It is an amenable number.

6661357 is a deficient number, since it is larger than the sum of its proper divisors (141779).

6661357 is a wasteful number, since it uses less digits than its factorization.

6661357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141778.

The product of its digits is 22680, while the sum is 34.

The square root of 6661357 is about 2580.9604801314. The cubic root of 6661357 is about 188.1572266289.

The spelling of 6661357 in words is "six million, six hundred sixty-one thousand, three hundred fifty-seven".