16256536563421 has 16 divisors (see below), whose sum is σ = 20739236018688. Its totient is φ = 12372839665200.

The previous prime is 16256536563419. The next prime is 16256536563457. The reversal of 16256536563421 is 12436563565261.

It is a happy number.

16256536563421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16256536563421 - 2¹ = 16256536563419 is a prime.

It is a super-3 number, since 3×16256536563421³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16256536563221) 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, 2454925195 + ... + 2454931816.

It is an arithmetic number, because the mean of its divisors is an integer number (1296202251168).

Almost surely, 2^{16256536563421} is an apocalyptic number.

16256536563421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16256536563421 is a deficient number, since it is larger than the sum of its proper divisors (4482699455267).

16256536563421 is a wasteful number, since it uses less digits than its factorization.

16256536563421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4909857072.

The product of its digits is 23328000, while the sum is 55.

The spelling of 16256536563421 in words is "sixteen trillion, two hundred fifty-six billion, five hundred thirty-six million, five hundred sixty-three thousand, four hundred twenty-one".