2011006166521 has 4 divisors (see below), whose sum is σ = 2193824908944. Its totient is φ = 1828187424100.

The previous prime is 2011006166501. The next prime is 2011006166621. The reversal of 2011006166521 is 1256616001102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011006166521 - 2²⁷ = 2010871948793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011006166501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91409371195 + ... + 91409371216.

It is an arithmetic number, because the mean of its divisors is an integer number (548456227236).

Almost surely, 2^{2011006166521} is an apocalyptic number.

It is an amenable number.

2011006166521 is a deficient number, since it is larger than the sum of its proper divisors (182818742423).

2011006166521 is a wasteful number, since it uses less digits than its factorization.

2011006166521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182818742422.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 2011006166521 in words is "two trillion, eleven billion, six million, one hundred sixty-six thousand, five hundred twenty-one".