661006165611 has 16 divisors (see below), whose sum is σ = 987449015808. Its totient is φ = 389782504800.

The previous prime is 661006165499. The next prime is 661006165627. The reversal of 661006165611 is 116561600166.

It is not a de Polignac number, because 661006165611 - 2¹⁴ = 661006149227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661006165611.

It is not an unprimeable number, because it can be changed into a prime (661006165811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270681075 + ... + 270683516.

It is an arithmetic number, because the mean of its divisors is an integer number (61715563488).

Almost surely, 2^661006165611 is an apocalyptic number.

661006165611 is a deficient number, since it is larger than the sum of its proper divisors (326442850197).

661006165611 is a wasteful number, since it uses less digits than its factorization.

661006165611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541364642.

The product of its (nonzero) digits is 38880, while the sum is 39.

Adding to 661006165611 its reverse (116561600166), we get a palindrome (777567765777).

The spelling of 661006165611 in words is "six hundred sixty-one billion, six million, one hundred sixty-five thousand, six hundred eleven".