16505621002 has 16 divisors (see below), whose sum is σ = 27313243272. Its totient is φ = 7432174080.

The previous prime is 16505620987. The next prime is 16505621003. The reversal of 16505621002 is 20012650561.

It can be written as a sum of positive squares in 4 ways, for example, as 12254711401 + 4250909601 = 110701^2 + 65199^2 .

It is not an unprimeable number, because it can be changed into a prime (16505621003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7740783 + ... + 7742914.

Almost surely, 2^16505621002 is an apocalyptic number.

16505621002 is a deficient number, since it is larger than the sum of its proper divisors (10807622270).

16505621002 is a wasteful number, since it uses less digits than its factorization.

16505621002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15483753.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 16505621002 in words is "sixteen billion, five hundred five million, six hundred twenty-one thousand, two".