6661702057 has 4 divisors (see below), whose sum is σ = 6726378880. Its totient is φ = 6597025236.

The previous prime is 6661702051. The next prime is 6661702067. The reversal of 6661702057 is 7502071666.

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.

It is a cyclic number.

It is not a de Polignac number, because 6661702057 - 2³ = 6661702049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661702051) 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, 32338257 + ... + 32338462.

It is an arithmetic number, because the mean of its divisors is an integer number (1681594720).

Almost surely, 2^6661702057 is an apocalyptic number.

It is an amenable number.

6661702057 is a deficient number, since it is larger than the sum of its proper divisors (64676823).

6661702057 is a wasteful number, since it uses less digits than its factorization.

6661702057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64676822.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 6661702057 is about 81619.2505295166. The cubic root of 6661702057 is about 1881.6047540873.

The spelling of 6661702057 in words is "six billion, six hundred sixty-one million, seven hundred two thousand, fifty-seven".