16500221250 has 80 divisors (see below), whose sum is σ = 43663248288. Its totient is φ = 4141216000.

The previous prime is 16500221201. The next prime is 16500221251. The reversal of 16500221250 is 5212200561.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16500221250.

It is not an unprimeable number, because it can be changed into a prime (16500221251) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 65664 + ... + 193163.

Almost surely, 2^16500221250 is an apocalyptic number.

16500221250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16500221250 is an abundant number, since it is smaller than the sum of its proper divisors (27163027038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16500221250 is a wasteful number, since it uses less digits than its factorization.

16500221250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258869 (or 258854 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 16500221250 in words is "sixteen billion, five hundred million, two hundred twenty-one thousand, two hundred fifty".