16555220646340 has 96 divisors (see below), whose sum is σ = 36044741134080. Its totient is φ = 6379534619136.

The previous prime is 16555220646257. The next prime is 16555220646457. The reversal of 16555220646340 is 4364602255561.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1312545874 + ... + 1312558486.

It is an arithmetic number, because the mean of its divisors is an integer number (375466053480).

Almost surely, 2^{16555220646340} is an apocalyptic number.

16555220646340 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 16555220646340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18022370567040).

16555220646340 is an abundant number, since it is smaller than the sum of its proper divisors (19489520487740).

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

16555220646340 is a wasteful number, since it uses less digits than its factorization.

16555220646340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17501 (or 17499 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 16555220646340 in words is "sixteen trillion, five hundred fifty-five billion, two hundred twenty million, six hundred forty-six thousand, three hundred forty".