2011661705551 has 16 divisors (see below), whose sum is σ = 2203511869440. Its totient is φ = 1827984202240.

The previous prime is 2011661705531. The next prime is 2011661705563. The reversal of 2011661705551 is 1555071661102.

It is a cyclic number.

It is not a de Polignac number, because 2011661705551 - 2⁷ = 2011661705423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011661705531) 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, 30425010 + ... + 30491056.

It is an arithmetic number, because the mean of its divisors is an integer number (137719491840).

Almost surely, 2^{2011661705551} is an apocalyptic number.

2011661705551 is a deficient number, since it is larger than the sum of its proper divisors (191850163889).

2011661705551 is a wasteful number, since it uses less digits than its factorization.

2011661705551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127874.

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 2011661705551 in words is "two trillion, eleven billion, six hundred sixty-one million, seven hundred five thousand, five hundred fifty-one".