16263455987 has 4 divisors (see below), whose sum is σ = 16331504160. Its totient is φ = 16195407816.

The previous prime is 16263455951. The next prime is 16263456073. The reversal of 16263455987 is 78955436261.

16263455987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16263455987 - 2¹² = 16263451891 is a prime.

It is a super-2 number, since 2×16263455987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16263955987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34023728 + ... + 34024205.

It is an arithmetic number, because the mean of its divisors is an integer number (4082876040).

Almost surely, 2^16263455987 is an apocalyptic number.

16263455987 is a deficient number, since it is larger than the sum of its proper divisors (68048173).

16263455987 is an equidigital number, since it uses as much as digits as its factorization.

16263455987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68048172.

The product of its digits is 10886400, while the sum is 56.

The spelling of 16263455987 in words is "sixteen billion, two hundred sixty-three million, four hundred fifty-five thousand, nine hundred eighty-seven".