16556207750420 has 24 divisors (see below), whose sum is σ = 37442500605384. Its totient is φ = 6113061323136.

The previous prime is 16556207750393. The next prime is 16556207750441. The reversal of 16556207750420 is 2405770265561.

It can be written as a sum of positive squares in 4 ways, for example, as 275192569744 + 16281015180676 = 524588^2 + 4034974^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31838860799 + ... + 31838861318.

It is an arithmetic number, because the mean of its divisors is an integer number (1560104191891).

Almost surely, 2^{16556207750420} is an apocalyptic number.

16556207750420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16556207750420 is an abundant number, since it is smaller than the sum of its proper divisors (20886292854964).

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

16556207750420 is a wasteful number, since it uses less digits than its factorization.

16556207750420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63677722139 (or 63677722137 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 16556207750420 in words is "sixteen trillion, five hundred fifty-six billion, two hundred seven million, seven hundred fifty thousand, four hundred twenty".