2166706651065 has 64 divisors (see below), whose sum is σ = 3856251469824. Its totient is φ = 1029978720000.

The previous prime is 2166706651049. The next prime is 2166706651073. The reversal of 2166706651065 is 5601566076612.

It is not a de Polignac number, because 2166706651065 - 2⁴ = 2166706651049 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2166706650999 and 2166706651017.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2784120 + ... + 3476310.

It is an arithmetic number, because the mean of its divisors is an integer number (60253929216).

Almost surely, 2^{2166706651065} is an apocalyptic number.

It is an amenable number.

2166706651065 is a deficient number, since it is larger than the sum of its proper divisors (1689544818759).

2166706651065 is a wasteful number, since it uses less digits than its factorization.

2166706651065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692582.

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 2166706651065 in words is "two trillion, one hundred sixty-six billion, seven hundred six million, six hundred fifty-one thousand, sixty-five".