661207017 has 8 divisors (see below), whose sum is σ = 881795520. Its totient is φ = 440711600.

The previous prime is 661207007. The next prime is 661207037. The reversal of 661207017 is 710702166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 661207017 - 2¹¹ = 661204969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661207007) 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, 4542 + ... + 36647.

It is an arithmetic number, because the mean of its divisors is an integer number (110224440).

Almost surely, 2^661207017 is an apocalyptic number.

It is an amenable number.

661207017 is a deficient number, since it is larger than the sum of its proper divisors (220588503).

661207017 is a wasteful number, since it uses less digits than its factorization.

661207017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46543.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 661207017 is about 25713.9459632317. The cubic root of 661207017 is about 871.1892034367.

It can be divided in two parts, 66120 and 7017, that added together give a palindrome (73137).

The spelling of 661207017 in words is "six hundred sixty-one million, two hundred seven thousand, seventeen".