16506553320 has 96 divisors (see below), whose sum is σ = 53757025920. Its totient is φ = 4392662400.

The previous prime is 16506553307. The next prime is 16506553333. The reversal of 16506553320 is 2335560561.

16506553320 is a `hidden beast` number, since 1 + 65 + 0 + 65 + 533 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (16506553307) and next prime (16506553333).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128245 + ... + 222395.

It is an arithmetic number, because the mean of its divisors is an integer number (559969020).

Almost surely, 2^16506553320 is an apocalyptic number.

16506553320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16506553320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26878512960).

16506553320 is an abundant number, since it is smaller than the sum of its proper divisors (37250472600).

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

16506553320 is a wasteful number, since it uses less digits than its factorization.

16506553320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94655 (or 94648 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The spelling of 16506553320 in words is "sixteen billion, five hundred six million, five hundred fifty-three thousand, three hundred twenty".