16317861787 has 4 divisors (see below), whose sum is σ = 16375522360. Its totient is φ = 16260201216.

The previous prime is 16317861739. The next prime is 16317861793. The reversal of 16317861787 is 78716871361.

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 16317861787 - 2¹⁹ = 16317337499 is a prime.

It is a super-2 number, since 2×16317861787² (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 (16317862787) 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, 28829862 + ... + 28830427.

It is an arithmetic number, because the mean of its divisors is an integer number (4093880590).

Almost surely, 2^16317861787 is an apocalyptic number.

16317861787 is a deficient number, since it is larger than the sum of its proper divisors (57660573).

16317861787 is an equidigital number, since it uses as much as digits as its factorization.

16317861787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57660572.

The product of its digits is 2370816, while the sum is 55.

The spelling of 16317861787 in words is "sixteen billion, three hundred seventeen million, eight hundred sixty-one thousand, seven hundred eighty-seven".