661600001101101 has 16 divisors (see below), whose sum is σ = 882331878709248. Its totient is φ = 440967397374000.

The previous prime is 661600001101097. The next prime is 661600001101159. The reversal of 661600001101101 is 101101100006166.

It is not a de Polignac number, because 661600001101101 - 2² = 661600001101097 is a prime.

It is a super-2 number, since 2×661600001101101² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661600001101001) 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, 1968697956 + ... + 1969033986.

It is an arithmetic number, because the mean of its divisors is an integer number (55145742419328).

Almost surely, 2^{661600001101101} is an apocalyptic number.

It is an amenable number.

661600001101101 is a deficient number, since it is larger than the sum of its proper divisors (220731877608147).

661600001101101 is a wasteful number, since it uses less digits than its factorization.

661600001101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481792.

The product of its (nonzero) digits is 216, while the sum is 24.

Adding to 661600001101101 its reverse (101101100006166), we get a palindrome (762701101107267).

The spelling of 661600001101101 in words is "six hundred sixty-one trillion, six hundred billion, one million, one hundred one thousand, one hundred one".