12055781857 has 8 divisors (see below), whose sum is σ = 13782700800. Its totient is φ = 10330029024.

The previous prime is 12055781851. The next prime is 12055781861. The reversal of 12055781857 is 75818755021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-12055781857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12055781857.

It is not an unprimeable number, because it can be changed into a prime (12055781851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269257 + ... + 310822.

It is an arithmetic number, because the mean of its divisors is an integer number (1722837600).

Almost surely, 2^12055781857 is an apocalyptic number.

It is an amenable number.

12055781857 is a deficient number, since it is larger than the sum of its proper divisors (1726918943).

12055781857 is an equidigital number, since it uses as much as digits as its factorization.

12055781857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583055.

The product of its (nonzero) digits is 784000, while the sum is 49.

The spelling of 12055781857 in words is "twelve billion, fifty-five million, seven hundred eighty-one thousand, eight hundred fifty-seven".