7866665023 has 4 divisors (see below), whose sum is σ = 8990474320. Its totient is φ = 6742855728.

The previous prime is 7866665003. The next prime is 7866665041. The reversal of 7866665023 is 3205666687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3205666687 = 15199 ⋅210913.

It is not a de Polignac number, because 7866665023 - 2⁵ = 7866664991 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 (7866665003) 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, 561904638 + ... + 561904651.

It is an arithmetic number, because the mean of its divisors is an integer number (2247618580).

Almost surely, 2^7866665023 is an apocalyptic number.

7866665023 is a deficient number, since it is larger than the sum of its proper divisors (1123809297).

7866665023 is a wasteful number, since it uses less digits than its factorization.

7866665023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123809296.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The square root of 7866665023 is about 88694.2220384169. Note that the first 3 decimals coincide. The cubic root of 7866665023 is about 1988.8264439897.

The spelling of 7866665023 in words is "seven billion, eight hundred sixty-six million, six hundred sixty-five thousand, twenty-three".