2066178797 has 4 divisors (see below), whose sum is σ = 2110140096. Its totient is φ = 2022217500.

The previous prime is 2066178781. The next prime is 2066178809. The reversal of 2066178797 is 7978716602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7978716602 = 2 ⋅3989358301.

It is a cyclic number.

It is not a de Polignac number, because 2066178797 - 2⁴ = 2066178781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066178727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21980579 + ... + 21980672.

It is an arithmetic number, because the mean of its divisors is an integer number (527535024).

Almost surely, 2^2066178797 is an apocalyptic number.

It is an amenable number.

2066178797 is a deficient number, since it is larger than the sum of its proper divisors (43961299).

2066178797 is an equidigital number, since it uses as much as digits as its factorization.

2066178797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43961298.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The square root of 2066178797 is about 45455.2394889742. The cubic root of 2066178797 is about 1273.6672059191.

The spelling of 2066178797 in words is "two billion, sixty-six million, one hundred seventy-eight thousand, seven hundred ninety-seven".