16554426623521 has 16 divisors (see below), whose sum is σ = 16663492800000. Its totient is φ = 16445551896576.

The previous prime is 16554426623507. The next prime is 16554426623531. The reversal of 16554426623521 is 12532662445561.

16554426623521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16554426623521 - 2¹⁷ = 16554426492449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16554426623531) 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, 1169999755 + ... + 1170013903.

It is an arithmetic number, because the mean of its divisors is an integer number (1041468300000).

Almost surely, 2^{16554426623521} is an apocalyptic number.

It is an amenable number.

16554426623521 is a deficient number, since it is larger than the sum of its proper divisors (109066176479).

16554426623521 is a wasteful number, since it uses less digits than its factorization.

16554426623521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20376.

The product of its digits is 10368000, while the sum is 52.

The spelling of 16554426623521 in words is "sixteen trillion, five hundred fifty-four billion, four hundred twenty-six million, six hundred twenty-three thousand, five hundred twenty-one".