2166323240557 has 32 divisors (see below), whose sum is σ = 2506205606400. Its totient is φ = 1834195304448.

The previous prime is 2166323240551. The next prime is 2166323240647. The reversal of 2166323240557 is 7550423236612.

It is a cyclic number.

It is not a de Polignac number, because 2166323240557 - 2¹⁹ = 2166322716269 is a prime.

It is a super-3 number, since 3×2166323240557³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166323240551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432483669 + ... + 432488677.

It is an arithmetic number, because the mean of its divisors is an integer number (78318925200).

Almost surely, 2^{2166323240557} is an apocalyptic number.

It is an amenable number.

2166323240557 is a deficient number, since it is larger than the sum of its proper divisors (339882365843).

2166323240557 is a wasteful number, since it uses less digits than its factorization.

2166323240557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7405.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 2166323240557 in words is "two trillion, one hundred sixty-six billion, three hundred twenty-three million, two hundred forty thousand, five hundred fifty-seven".