2166071026651 has 16 divisors (see below), whose sum is σ = 2502252400896. Its totient is φ = 1836679512096.

The previous prime is 2166071026633. The next prime is 2166071026667. The reversal of 2166071026651 is 1566201706612.

It is a cyclic number.

It is not a de Polignac number, because 2166071026651 - 2¹⁹ = 2166070502363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2166071026598 and 2166071026607.

It is not an unprimeable number, because it can be changed into a prime (2166071026751) 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, 4091821 + ... + 4590766.

It is an arithmetic number, because the mean of its divisors is an integer number (156390775056).

Almost surely, 2^{2166071026651} is an apocalyptic number.

2166071026651 is a deficient number, since it is larger than the sum of its proper divisors (336181374245).

2166071026651 is a wasteful number, since it uses less digits than its factorization.

2166071026651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8682978.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 2166071026651 in words is "two trillion, one hundred sixty-six billion, seventy-one million, twenty-six thousand, six hundred fifty-one".