16626863405851 has 4 divisors (see below), whose sum is σ = 16626941962792. Its totient is φ = 16626784848912.

The previous prime is 16626863405849. The next prime is 16626863405881. The reversal of 16626863405851 is 15850436862661.

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 16626863405851 - 2¹ = 16626863405849 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 16626863405851.

It is not an unprimeable number, because it can be changed into a prime (16626863405821) 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, 38960130 + ... + 39384583.

It is an arithmetic number, because the mean of its divisors is an integer number (4156735490698).

Almost surely, 2^{16626863405851} is an apocalyptic number.

16626863405851 is a deficient number, since it is larger than the sum of its proper divisors (78556941).

16626863405851 is an equidigital number, since it uses as much as digits as its factorization.

16626863405851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78556940.

The product of its (nonzero) digits is 49766400, while the sum is 61.

The spelling of 16626863405851 in words is "sixteen trillion, six hundred twenty-six billion, eight hundred sixty-three million, four hundred five thousand, eight hundred fifty-one".