2166651801 has 8 divisors (see below), whose sum is σ = 3209854560. Its totient is φ = 1444434516.

The previous prime is 2166651787. The next prime is 2166651841. The reversal of 2166651801 is 1081566612.

It is not a de Polignac number, because 2166651801 - 2¹⁰ = 2166650777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166651841) 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, 40123155 + ... + 40123208.

It is an arithmetic number, because the mean of its divisors is an integer number (401231820).

Almost surely, 2^2166651801 is an apocalyptic number.

It is an amenable number.

2166651801 is a deficient number, since it is larger than the sum of its proper divisors (1043202759).

2166651801 is an equidigital number, since it uses as much as digits as its factorization.

2166651801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80246372 (or 80246366 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 2166651801 is about 46547.3071294140. The cubic root of 2166651801 is about 1293.9863867158.

The spelling of 2166651801 in words is "two billion, one hundred sixty-six million, six hundred fifty-one thousand, eight hundred one".