661106165111 has 8 divisors (see below), whose sum is σ = 755576848800. Its totient is φ = 566642217888.

The previous prime is 661106165089. The next prime is 661106165113. The reversal of 661106165111 is 111561601166.

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 661106165111 - 2¹⁰ = 661106164087 is a prime.

It is a super-2 number, since 2×661106165111² (a number of 24 digits) 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 (661106165113) 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, 1472036 + ... + 1867913.

It is an arithmetic number, because the mean of its divisors is an integer number (94447106100).

Almost surely, 2^661106165111 is an apocalyptic number.

661106165111 is a deficient number, since it is larger than the sum of its proper divisors (94470683689).

661106165111 is a wasteful number, since it uses less digits than its factorization.

661106165111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368233.

The product of its (nonzero) digits is 6480, while the sum is 35.

Adding to 661106165111 its reverse (111561601166), we get a palindrome (772667766277).

The spelling of 661106165111 in words is "six hundred sixty-one billion, one hundred six million, one hundred sixty-five thousand, one hundred eleven".