2051121121566 has 32 divisors (see below), whose sum is σ = 4476353753088. Its totient is φ = 621387911040.

The previous prime is 2051121121537. The next prime is 2051121121619. The reversal of 2051121121566 is 6651211211502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3846366 + ... + 4347041.

It is an arithmetic number, because the mean of its divisors is an integer number (139886054784).

Almost surely, 2^{2051121121566} is an apocalyptic number.

2051121121566 is an abundant number, since it is smaller than the sum of its proper divisors (2425232631522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2051121121566 is a wasteful number, since it uses less digits than its factorization.

2051121121566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8197216.

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 2051121121566 in words is "two trillion, fifty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, five hundred sixty-six".