15855455851 has 4 divisors (see below), whose sum is σ = 15873332112. Its totient is φ = 15837579592.

The previous prime is 15855455849. The next prime is 15855455857.

15855455851 is nontrivially palindromic in base 10.

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 15855455851 - 2¹ = 15855455849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15855455857) 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, 8936800 + ... + 8938573.

It is an arithmetic number, because the mean of its divisors is an integer number (3968333028).

Almost surely, 2^15855455851 is an apocalyptic number.

15855455851 is a deficient number, since it is larger than the sum of its proper divisors (17876261).

15855455851 is an equidigital number, since it uses as much as digits as its factorization.

15855455851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17876260.

The product of its digits is 4000000, while the sum is 52.

The spelling of 15855455851 in words is "fifteen billion, eight hundred fifty-five million, four hundred fifty-five thousand, eight hundred fifty-one".