2011151105661 has 8 divisors (see below), whose sum is σ = 2681546452704. Its totient is φ = 1340761581200.

The previous prime is 2011151105657. The next prime is 2011151105671. The reversal of 2011151105661 is 1665011511102.

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 2011151105661 - 2² = 2011151105657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011151105671) 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, 573291 + ... + 2085896.

It is an arithmetic number, because the mean of its divisors is an integer number (335193306588).

Almost surely, 2^{2011151105661} is an apocalyptic number.

It is an amenable number.

2011151105661 is a deficient number, since it is larger than the sum of its proper divisors (670395347043).

2011151105661 is a wasteful number, since it uses less digits than its factorization.

2011151105661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911291.

The product of its (nonzero) digits is 1800, while the sum is 30.

Adding to 2011151105661 its reverse (1665011511102), we get a palindrome (3676162616763).

The spelling of 2011151105661 in words is "two trillion, eleven billion, one hundred fifty-one million, one hundred five thousand, six hundred sixty-one".