16391655420 has 144 divisors (see below), whose sum is σ = 53449286688. Its totient is φ = 3742502400.

The previous prime is 16391655407. The next prime is 16391655421. The reversal of 16391655420 is 2455619361.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16391655421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3210870 + ... + 3215970.

It is an arithmetic number, because the mean of its divisors is an integer number (371175602).

Almost surely, 2^16391655420 is an apocalyptic number.

16391655420 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 16391655420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26724643344).

16391655420 is an abundant number, since it is smaller than the sum of its proper divisors (37057631268).

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

16391655420 is a wasteful number, since it uses less digits than its factorization.

16391655420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6220 (or 6211 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 16391655420 in words is "sixteen billion, three hundred ninety-one million, six hundred fifty-five thousand, four hundred twenty".