16505211007 has 4 divisors (see below), whose sum is σ = 16505599936. Its totient is φ = 16504822080.

The previous prime is 16505210993. The next prime is 16505211017. The reversal of 16505211007 is 70011250561.

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 16505211007 - 2²³ = 16496822399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505211017) 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, 121743 + ... + 218704.

It is an arithmetic number, because the mean of its divisors is an integer number (4126399984).

Almost surely, 2^16505211007 is an apocalyptic number.

16505211007 is a deficient number, since it is larger than the sum of its proper divisors (388929).

16505211007 is an equidigital number, since it uses as much as digits as its factorization.

16505211007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388928.

The product of its (nonzero) digits is 2100, while the sum is 28.

Adding to 16505211007 its reverse (70011250561), we get a palindrome (86516461568).

The spelling of 16505211007 in words is "sixteen billion, five hundred five million, two hundred eleven thousand, seven".