16555224507538 has 4 divisors (see below), whose sum is σ = 24832836761310. Its totient is φ = 8277612253768.

The previous prime is 16555224507527. The next prime is 16555224507541. The reversal of 16555224507538 is 83570542255561.

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

It can be written as a sum of positive squares in only one way, i.e., 15955447058329 + 599777449209 = 3994427^2 + 774453^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4138806126883 + ... + 4138806126886.

Almost surely, 2^{16555224507538} is an apocalyptic number.

16555224507538 is a deficient number, since it is larger than the sum of its proper divisors (8277612253772).

16555224507538 is an equidigital number, since it uses as much as digits as its factorization.

16555224507538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8277612253771.

The product of its (nonzero) digits is 50400000, while the sum is 58.

The spelling of 16555224507538 in words is "sixteen trillion, five hundred fifty-five billion, two hundred twenty-four million, five hundred seven thousand, five hundred thirty-eight".