16355445317321 has 16 divisors (see below), whose sum is σ = 18099294811776. Its totient is φ = 14654559360000.

The previous prime is 16355445317291. The next prime is 16355445317369. The reversal of 16355445317321 is 12371354455361.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16355445317321 - 2¹⁴ = 16355445300937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16355445317321.

It is not an unprimeable number, because it can be changed into a prime (16355445317821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807320 + ... + 5776041.

It is an arithmetic number, because the mean of its divisors is an integer number (1131205925736).

Almost surely, 2^{16355445317321} is an apocalyptic number.

16355445317321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16355445317321 is a deficient number, since it is larger than the sum of its proper divisors (1743849494455).

16355445317321 is a wasteful number, since it uses less digits than its factorization.

16355445317321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6586624.

The product of its digits is 4536000, while the sum is 50.

The spelling of 16355445317321 in words is "sixteen trillion, three hundred fifty-five billion, four hundred forty-five million, three hundred seventeen thousand, three hundred twenty-one".