16955893621 has 4 divisors (see below), whose sum is σ = 17369452044. Its totient is φ = 16542335200.

The previous prime is 16955893589. The next prime is 16955893631. The reversal of 16955893621 is 12639855961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5444964100 + 11510929521 = 73790^2 + 107289^2 .

It is a cyclic number.

It is not a de Polignac number, because 16955893621 - 2⁵ = 16955893589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16955893631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206779150 + ... + 206779231.

It is an arithmetic number, because the mean of its divisors is an integer number (4342363011).

Almost surely, 2^16955893621 is an apocalyptic number.

It is an amenable number.

16955893621 is a deficient number, since it is larger than the sum of its proper divisors (413558423).

16955893621 is an equidigital number, since it uses as much as digits as its factorization.

16955893621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413558422.

The product of its digits is 3499200, while the sum is 55.

The spelling of 16955893621 in words is "sixteen billion, nine hundred fifty-five million, eight hundred ninety-three thousand, six hundred twenty-one".