12220551787 has 4 divisors (see below), whose sum is σ = 12387956680. Its totient is φ = 12053146896.

The previous prime is 12220551769. The next prime is 12220551829. The reversal of 12220551787 is 78715502221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12220551787 - 2²³ = 12212163179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12220551767) 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, 83702337 + ... + 83702482.

It is an arithmetic number, because the mean of its divisors is an integer number (3096989170).

Almost surely, 2^12220551787 is an apocalyptic number.

12220551787 is a deficient number, since it is larger than the sum of its proper divisors (167404893).

12220551787 is an equidigital number, since it uses as much as digits as its factorization.

12220551787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167404892.

The product of its (nonzero) digits is 78400, while the sum is 40.

The spelling of 12220551787 in words is "twelve billion, two hundred twenty million, five hundred fifty-one thousand, seven hundred eighty-seven".