2166323240551 has 2 divisors, whose sum is σ = 2166323240552. Its totient is φ = 2166323240550.

The previous prime is 2166323240537. The next prime is 2166323240647. The reversal of 2166323240551 is 1550423236612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166323240551 - 2⁵ = 2166323240519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166323210551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083161620275 + 1083161620276.

It is an arithmetic number, because the mean of its divisors is an integer number (1083161620276).

Almost surely, 2^{2166323240551} is an apocalyptic number.

2166323240551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166323240551 is an equidigital number, since it uses as much as digits as its factorization.

2166323240551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 2166323240551 in words is "two trillion, one hundred sixty-six billion, three hundred twenty-three million, two hundred forty thousand, five hundred fifty-one".