661006117 has 8 divisors (see below), whose sum is σ = 665888256. Its totient is φ = 656139792.

The previous prime is 661006111. The next prime is 661006123. The reversal of 661006117 is 711600166.

661006117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661006111) and next prime (661006123).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661006117 is a prime.

It is a super-2 number, since 2×661006117² = 873858173422835378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661006111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87588 + ... + 94834.

It is an arithmetic number, because the mean of its divisors is an integer number (83236032).

Almost surely, 2^661006117 is an apocalyptic number.

It is an amenable number.

661006117 is a deficient number, since it is larger than the sum of its proper divisors (4882139).

661006117 is a wasteful number, since it uses less digits than its factorization.

661006117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7907.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 661006117 is about 25710.0392259522. The cubic root of 661006117 is about 871.1009609571.

The spelling of 661006117 in words is "six hundred sixty-one million, six thousand, one hundred seventeen".