6661708917 has 4 divisors (see below), whose sum is σ = 8882278560. Its totient is φ = 4441139276.

The previous prime is 6661708903. The next prime is 6661708931. The reversal of 6661708917 is 7198071666.

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 (6661708903) and next prime (6661708931).

It is a cyclic number.

It is not a de Polignac number, because 6661708917 - 2⁶ = 6661708853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6661708917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661708717) 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, 1110284817 + ... + 1110284822.

It is an arithmetic number, because the mean of its divisors is an integer number (2220569640).

Almost surely, 2^6661708917 is an apocalyptic number.

It is an amenable number.

6661708917 is a deficient number, since it is larger than the sum of its proper divisors (2220569643).

6661708917 is a wasteful number, since it uses less digits than its factorization.

6661708917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220569642.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 6661708917 is about 81619.2925539054. The cubic root of 6661708917 is about 1881.6053999585.

The spelling of 6661708917 in words is "six billion, six hundred sixty-one million, seven hundred eight thousand, nine hundred seventeen".