16273218820 has 24 divisors (see below), whose sum is σ = 34294526784. Its totient is φ = 6486284256.

The previous prime is 16273218779. The next prime is 16273218827. The reversal of 16273218820 is 2881237261.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16273218827) 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, 1431904 + ... + 1443223.

It is an arithmetic number, because the mean of its divisors is an integer number (1428938616).

Almost surely, 2^16273218820 is an apocalyptic number.

16273218820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16273218820 is an abundant number, since it is smaller than the sum of its proper divisors (18021307964).

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

16273218820 is a wasteful number, since it uses less digits than its factorization.

16273218820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875419 (or 2875417 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 16273218820 in words is "sixteen billion, two hundred seventy-three million, two hundred eighteen thousand, eight hundred twenty".