12166477777 has 4 divisors (see below), whose sum is σ = 12167665776. Its totient is φ = 12165289780.

The previous prime is 12166477723. The next prime is 12166477783. The reversal of 12166477777 is 77777466121.

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: 77777466121 = 3511 ⋅22152511.

It is a cyclic number.

It is not a de Polignac number, because 12166477777 - 2²³ = 12158089169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12166477717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578503 + ... + 599164.

It is an arithmetic number, because the mean of its divisors is an integer number (3041916444).

Almost surely, 2^12166477777 is an apocalyptic number.

It is an amenable number.

12166477777 is a deficient number, since it is larger than the sum of its proper divisors (1187999).

12166477777 is a wasteful number, since it uses less digits than its factorization.

12166477777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187998.

The product of its digits is 4840416, while the sum is 55.

The spelling of 12166477777 in words is "twelve billion, one hundred sixty-six million, four hundred seventy-seven thousand, seven hundred seventy-seven".