16311219209820 has 72 divisors (see below), whose sum is σ = 49584227749056. Its totient is φ = 4340263923072.

The previous prime is 16311219209749. The next prime is 16311219209821. The reversal of 16311219209820 is 2890291211361.

16311219209820 is a `hidden beast` number, since 1 + 631 + 1 + 2 + 1 + 9 + 2 + 0 + 9 + 8 + 2 + 0 = 666.

16311219209820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16311219209820² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16311219209821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97776147 + ... + 97942826.

It is an arithmetic number, because the mean of its divisors is an integer number (688669829848).

Almost surely, 2^{16311219209820} is an apocalyptic number.

16311219209820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16311219209820 is an abundant number, since it is smaller than the sum of its proper divisors (33273008539236).

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

16311219209820 is a wasteful number, since it uses less digits than its factorization.

16311219209820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195719451 (or 195719446 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 16311219209820 in words is "sixteen trillion, three hundred eleven billion, two hundred nineteen million, two hundred nine thousand, eight hundred twenty".